Learn Your Guitar Amp!

[@justinguitar]

*Great Guitar Tone Starts Here:* www.justinguitar.com/guitar-lessons/great-guitar-tone-starts-here-bg-1507

[@frankfarklesberry]

I can't help but chuckle through the whole thing. You did a great job, yet proved how much of a rabbit hole in time consumption it is playing with amps and effects. Even the sounds you said sound "too ___" sounded cool, and reminiscent of some song. I frequently find myself never settling on the ideal sound for a song. So many choices for one song to my ear. Every time it seems like a one-off. :D

[@Tyfu39944]

Justin 11-12 years ago I worked through your beginners course, and I just wanted to say thank you for giving me the start I needed to become a performing artist and a guitar teacher myself

[@annarakannan6620]

Listening to you is therapeutic. Not only are you a phenomenal person and teacher, you are a blessing to the guitar community. Thank you sir for all you do for us. God bless you.

[@paulstebbing2578]

Thanks

[@justinguitar]

Thank you Paul! Appreciate your support a big deal. :)

[@ulrichminky9495]

My Roland Jazz Chorus 40 arrived 3 days ago. I am thrilled with this amp.

[@stuminnis4050]

I had one of those in the early 90s and stupidly sold it.

[@ulrichminky9495]

@@stuminnis4050 I now have 6 amps and many more guitars however I always think about the ones that got away. I sold a heavily modded telecaster in 1996, I miss that guitar every day. The only saving grace is that it is now in the hands of the guy that modded it in the first place.

[@guillaumegoulet1480]

Thanks!

[@justinguitar]

Thank you!!! :)

[@fabienbourdier9847]

My teacher made me buy a yamaha THR10II and i like it a lot, there are a lot of amp simulation on this, most sound good, but theres one in particular, that sounds so bad but i still love it it sounds like running very high voltage through a toaster

[@auricgoldfinger8478]

Bought an orange crush 12 to go with my Squier Affinity Telecaster. All I need, but now I understand it better. I’m on lesson 10 of the beginner course

[@zetaminor77]

Thank you for explaining the Presence Control!

[@ColdPie]

I've found the little Mustang Micro headphone amp to be a fantastic beginner amp. Lots of great sounds, not a load of options to get lost in, Bluetooth support for backing tracks and lesson videos. And cheap.

[@joeadams415]

I just checked that out and it looks like a great little amp! Thanks for the suggestion!

[@stevegarbutt6593]

Hi Justin this series of videos are brilliant for helping demystify getting THE tone and the endless possibilities….I aspire to getting a Kemper one day. Love the lessons and the way you always come up with new ways to keep the guitar journey fresh and exciting. Thank you.

[@Mr3wheeling]

Justin I didn't know for a while that it's not the guitar you have but it's the amp you got. I bought the boss katana artist MKii not too long ago and wow the sound I get out of my LP now and also from my Telecaster and my SG was mind blowing. I haven't even explored it on the internet yet from Boss. You do a great job on your videos and I think you for it.

[@stevendixon8790]

Thanks Justin , just finished your beginners course and bought a spark. this video came at just the right time. thanks.

[@justinguitar]

Fantastic! Enjoy :)

[@VideoGameAtlas]

I have a spark also and it's freaking awesome. Enjoy

[@peterstaniec8898]

@@VideoGameAtlas Love my Spark

[@gertvanrooy428]

Very nice video! One thing I should mention though, which isnt talked about but that is essential for beginners (like me - I found out the hard way) buying their first amp, is the wattage or output of the amp. Most of us new at guitar playing that want to play electric, will do so at home. 20 watt is way (way -WAY) too loud. Even 5 watts can be very loud. Just turn down the volume, you say. Apparently it doesn't work that way. A lot of the sounds you "have in you head" will not surface at lower volumes and will just be hidden in your amp. Especially tube amps where the point almost is to push the tubes into breaking up. There are amps out there that have a dial where you can decimate the output and that way it will will be a lot easier to experiment with overdriven sounds without being stuck in everlasting clean. Boss Katana MKII 50 has a 0,5W output (wich is plenty loud). Orange Rocker 15 has dials for 15, 7, 1 and 0,5watts , and e.g. the Blackstar HT-20R MKII can be lowered from 20 to 2watts. For me personally this is a dealbreaker (unless you want to buy an attenuator).

[@roberteastwood9886]

Finally someone has posted what I think! I love Justins posts, but I think he has this completely wrong: when I started I found these profiling amps much too complicated, and needed a really simple amp. Even 6 years down the line, I can understand the attraction of amps like the Kemper and Blackstar, but I find the amps I bought originally, too punchy. I have an orange 60 watt for gigs but at home and for practice the 20 watt was far too punchy. I got really abused when I made this point some time ago, so if anyone gets angry about my comment I will delete it.

[@scrimpmster]

@@roberteastwood9886 Come on, please don't delete a comment just because your opinion may offend someone. Anyway, I feel the same way. I have a Line6 spider V 60. Great amp but sometimes I feel like there 's way too much going on. For the price the amount of amps and fx you get is actually great than going out and even buying single amp and individual pedals. However it can just get way too overwhelming very quickly in my opinion. I still have it as well as an orange crush 35rt and am thinking of getting a blackstar ht5. I tested out the blackstar and even at 0.5w it's very loud.

[@almondedang6190]

Thank you Sir. I'm learning a lot from your videos.

[@thattassiewargamer]

I’ve recently purchased a Positive Grid Spark 40 after starting on a 10 watt starter amp and I am blown away with the range of sounds it can produce. It makes practice so much more enjoyable.

[@swiffs1]

I totally agree. The Spark is incredibly versatile and easy to use.

[@barrywarren4221]

Out of all the amps I have, I prefer my 1970'ish Peavey Revolution amp. I has everything you need in the tone department, for playing gig's and big stage. I'm surprised it did become more popular. But the amp I have that has the best reverb is my 1960'ish Sun Concert Lead amp.which was my first amp I used for gigging.

[@blazerhawkdarren68]

I was given an Ibanez acoustic/electric combo from my late uncle and it came with a Behringer amp. Still working on figuring it out.

[@CNCTEMATIC]

I could be wrong, but I understood that the presence control on some amps, including Marshalls I believe, interacts somehow with the power amp, and/or is a separate part of the circuit from the bass, middle and treble controls. When you took it out completely, it took some mids with it, in a way the treble didn't.

[@SeanMC5]

Perfect timing for me! Getting my own amp finally. Been using the studio’s or headphone mini amps til now. Going with a supro keeley custom 12.

[@erwinevans466]

BIAS FX 2 has been excellent for me as a beginner! I can easily get any sound I want with all of the different options, and if I'm unsure of how to achieve that sound the presets always sound great! Paired with a Scarlett solo it has been money well spent in my opinion.

[@khushalkhans]

Is it free?

[@erwinevans466]

@@khushalkhans Yes, they do have a free version!

[@khushalkhans]

@@erwinevans466 oh thanks man I'm using amplitude and I'm looking to explore more software before I commit to one

[@terryjohinke518]

Good advice. I have a Princeton Reverb and a Boss Katana. I need to spend more time on amplifier sounds. I love my Boss compressor CS-# pedal which is great. Thanks Justin. ( Terry from Downunder).

[@abedominals]

Hey Justin one thing you didn't mention is where you are using your amp. If you're in your bedroom even at loud volumes it will sound much different than when you bring it to your buddy's garage and even more so if you are playing outside in the open. Always test your gear wherever you are performing even if you know how you expect it to sound in your practice space.

[@MrTNT49]

Justin

[@daveredknapmedium]

Hi Justin. I really appreciate your videos. One comment I would like to make is - Why start with so much distortion and O/D? Why not start with a clean tone so that we can hear what the guitar and amp really sound like, and then add the Distortion and O/D later. I notice on KZbin that so many guitarists demonstrating equipment very rarely demo a clean sound. I'm a "Wrinkly Rocker" and a Shadows fan so possibly biased!! LOL

[@russkgreen]

Rise and Fall of Flingel Bunt Apache Classics Haven’t thought about Shadows in years

[@mitchellcastell5348]

I have a Peavy VYPYR and it has some great amp modeling and extra effects as well.

[@ssm445]

I got a Yamaha THR10II, and since I got it, my practice time is so much more enjoyable than with what I had before (Multifx-Pedals, Spark40). Having options is great, but getting a good tone that inspires you to play more is *gold*. I found myself dialing in tones with the previous options instead of practicing. Getting a good tone with the THR is a matter of seconds. I heard it's quite the same with the Katana.

[@nicholas19644]

Tone controls and pick up selection are also important. Oh and how you play. Thanks for the upload.

[@justinguitar]

tone and pup selection were in the last video in this series :)

[@benmalone6139]

Loving your work Justin. This is great content...well done

[@Rob1964b]

I have an ancient Boss GT-PRO rack mounted fx which imitates different amps as well as adding fx. I play a nylon strung acoustic guitar through it.

[@aziz8]

This has been really helpful, like always. Thank you for everything I‘ve learned from you over the past 9 years.

[@JB19504]

Love my AXE FX III by Fractal. World class Gold Standard modeler. No additional interface needed for my computer. Also own a Silverface Twin 68 Reissue. Now, if I could just play like you, Justin!

[@DeT0ast]

Hey Justin, I'm a student in graphic design and was wondering how I could contribute (with my skills) to this channel or website. You give all this info out for free and thanks to you I got a perfect start 1.5 years ago. Hit me up if you're interested. (Of course I don't intend to take any money) Cheers and thank you!

[@justinguitar]

Hey! :) Please send an email to [e-mail]. We have a community of volunteers, and sometimes we also hire interns and new professionals. Cheers, and tyvm for your support.

[@dontrapani7778]

Good job on the Gain, Bass, Middle, Treble, and Presence. But my amp has Volume and Master in addition, so what do they do, and how does the Gain work with those??

[@matwhite57]

Sheesh! This is why I’ve stuck with an acoustic guitar for over forty years

[@tedlivermore6955]

Same here although I m gonna put a pickup in it and got a small acoustic amp for it.

[@stringman509]

Justin mine drives me mad just trying to get that mellow sound on a hot rod deluxe. Best wishes Colin UK 🇬🇧 👍

[@waynecarlson9168]

Your my favorite teacher 😃

[@nigel_wadsworth]

Great video Justin. I started with a Katana, worked out what I like so got a Princeton 65RI and hook it up with pedals for dirt! Highly recommend something like this to start out with.

[@ChristopherDowning]

Just to confuse everyone. There are basically two settings you need - one for home use and practice and one for playing loud in a band. The home/solo setting is way more bass and treble with a sort of scooped-out middle. Think the classic Deluxe Reverb sort of sound. But in a band, it's almost the opposite - what sounds pretty lack lustre at home is perfect for a band situation where you need to find your home in the mix. The bass is lost because you have a bass player and the top is lost in the cymbals and percussion. Just to make it more difficult the keys and vocalist are pretty much just where you want to be as well. So you'll need to find a frequency that fits around all that or you'll just not be heard or heard badly (too loudly). Get those mids up a lot. My current band setting on a DV Mark Raw Dawg is unbelievably extreme - Bass 2 Mids 8 Treble 2. The Raw Dawg is very bassy and has a top edge that's just too harsh - so that's what drives those settings. It does have a set of pedals going into it, but you can see how some settings just seem all wrong - - but in a band - just right!! There's a world of difference playing a solo jazz job and playing lead and rhythm in a rock band.

[@MashaT22]

Wow, that’s quite the Kempfer toaster you got there, Justin! 😉😂 I have a question on the subject of amps. How come people playing guitar at home buy guitar amps/PA’s when they could probably just plug the guitar into a set of high quality stereo speakers? I’m not fully understanding why people need a guitar amp or PA. Can high quality speakers not handle the audio coming out of the guitar, or is there another reason?

[@wickedgit]

I have a boss Katana wich can almost sound like a fender when you hit the variation knob. I also have a Blackstar silverline wich can emulate different preamp tubes like KT88, EL34, 6V6, 6L6, EL84,KT66. KT88 is a Marshall major and 6V6 must be a Fender amp, 6L6 is a Mesa Boogie and EL84 must be a Vox ac30. When you turn the knob it really changes the sound. I personaly love the EL34 then i get a Marshall 80s type tone. If i play heavy metal i like the 6L6. When i come to the EQ ive learned to turn up the mids a bit otherwise it gets to muddy or the sounds doesnt comes through, you cant hear the notes being played. If i do want to scoop the mids when i play I compensate with a little presence and treble....but I gotta be careful with the presence.....it can be overpowering and make it too sharp sounding. The katana's treble is very sensetive so i dont really miss the presence....(I have the 50mk2).

[@smithscarborough]

You da man, Justin!

[@lindenrosam4781]

Thanks Justin for another informative lesson. There’s a lot there to get my head around but I note that practice and ‘listening’ are key to progression! I am a subscriber to all your apps and love the courses. Thank you for making learning guitar easier and fun! I have a Fender Mustang LT25 modelling amp with tons of presets and space to build and save more - I must play with it!,

[@stevehanson2398]

Hey Justin. Thank you so much for all your invaluable lessons. I've played acoustic for a few years and just decided to get a cheap electric and make some real noise. This series of videos is really helpful for me. Cheers🍺 By the way, when you first put reverb on, it really reminded me of Rush 2112. I'd love to see a tutorial on how to play that one🤣 It might be a little above my level at the moment, but I'll get there👍🏻

[@karleyyork9001]

Thank You, Sir.

[@drewdietz2115]

excellent tutorial. thanks Justin, well explained

[@paulniccolls785]

Thx Justin, great video, my mate lent me a Fender GDec to try out & felt a little scared of it, after watching this I feel I can understand it a little more & can now try some stuff out on it, thx again

[@nicholas19644]

The Fender GDec is a great starter amp. You can find tons of presets online for it.

[@paulniccolls785]

Thx Nick I will take. Look for some

[@rolandoamado1459]

POD Express!! 🎶🎵

[@TheNewenglandboys]

Justin, I'd like your take on the new Fender tonemaster blonde?

[@deltablues8141]

Hi Justin, I really believe your videos are the best around for guitarists old and young. I fall into the former category ha ha. I have a request if I may. I noted the Lazy J amp behind you and as I also own one I wondered if you could demo the amp to help guide users of the achievable tones from clean warm through to nice blues tones and rock etc. I do hope you consider my suggestion as I for one need a guide.

[@lukesteverything627]

Nice vid but I don't understand it. I bought a budget Boss amp / cab simulator (IR-200) to try to get to terms with it. My understanding is that there's no point running it through a cab because different speakers = different sound. If it's only for studio work surely you would use the profiles in the DAW you have. I'm obviously missing the point so if anyone can put me right I'll be grateful.

[@PotterheadMando]

I have a Vox Mod 3 G2, which is like a portable Vox Amp emulator, in a sweet little Combo package, which I've used for practice for a few years now. It sound quite good for practicing, if you're on a budget, IMO. Thanks for the video, Justin! - David M. Kelly, USA

[@GaveMeGrace1]

Great! Thank you.

[@mikea75201]

That's why I bought a Fender Mustang LT25 and a Fender Mustang Micro.

[@Th3Jac0b]

I'm currently consider buying it? Do you like that amp? Is it worth?

[@mikea75201]

@@Th3Jac0b I like them both.

[@anthonylane9547]

Justin. How about doing a vid about good amps for acoustic guitars. Budget/ Expensive

[@shegocrazy]

I also got the LT25 as my first amp. So many adjustments and tones possible it's a mind f### trying to get the sound right.

[@freesk8]

Ahh, so I was totally justified in feeling overwhelmed? Thanks! :)

[@freesk8]

Everything affects your tone. The possibilities are infinite. Thanks, though, I really appreciate the excellent lesson! :)

[@markbrown382]

Thanks for the great video. I’ve been trying to get a handle on my tone and there’s advice in this one that’ll really help. So what’s the deal with the kangaroo?

[@mwfxtechnicalanalysis9136]

Hi Justin, can you explain how to get the shred type sound. It's like the vocal melody of songs with a super cool sound. Sophie Lloyd sort of style.

[@beat_guitar]

Interesting vid, as always 🤙 Bought the Boss Katana a while ago. Pretty good sound and various options.

[@justinguitar]

Good choice! Cheers.

[@shegocrazy]

I've got a small Fender and it's mystifying how many tone adjustments and presets are possible. I'd pay $$$ for a guide that explains how to get close to a particular sound that matches the song I'm trying to play. e.g. I spent probably an hour trying to get the Oasis sound (think Morning Glory for example) and am still not happy. It's not possible to get it exact because NG uses a different guitar and different amp but how to get it close?

[@tomeyster3360]

Thank you

[@mikecarter3332]

Thanks for this informative video tutorial Justin. I have an unpowered Kemper “toaster” and am looking for advice on what is the best medium for transferring the Kemper output to a room in your opinion. I have a powered PA system, an Evolve EV50, 8 inch studio monitors and a couple of amps. None of them make the profiles sound as I hear on the various videos I have seen so your opinion would be really appreciated.

[@gr637]

‘When you have only one knob you should experiment with it…you’ve got to know it’. Justin

[@ifax1245]

Justin, which DAW do you use?

[@degtiarenko]

Hi fellow guitar learners. Can anyone please give some hints on how master, volume, and gain settings interact? I am kinda lost on which one of the three should I change when.

[@chonlanglais]

Hi justin really good information on this video thanks a lot. I have a blackstar silverline spécial amp and i wanted to know what you think of them and also it has 2 volume knobs (a preamp volume and a master volume) i don't quite understand the difference between them. Could you explain? Thanks again 👍

[@siggiAg86]

What does he mean by profile? Is it for a digital amp?

[@cirisirpula152]

Isnt tubescreamer (mid focused) common in metal, yet scooping mids is also common in metal. A bit confusimg :D

[@shapourdashtpour63]

I get a buzz in my amp . any idea how I can get rid of it? specially since I have a Distortion pedal DS-1 and need it for practicing tapping. it is very annoying

[@Belindaxtz660]

Justin..... why have you got a wiring diagram tatooed on your right forarm? ( 4.35)... 🤔

[@flintdavis2]

That guitar he’s playing grabbed all my attention, 3 different pickups.

[@revjohnh64]

Hi Justin. I recently watched your interview with katana preset guru Jura Nery. I listened to a bunch of his fender amp presets on his page and they sounded awesome. However I only have the katana 50 which has a basic 4 ohm speaker and when I watched a few katana speaker upgrade videos, upgrading the speaker made the sounds a lot more ‘valvey” anyway. I assume on his demos, Juea is using his katana artist with the waza craft speaker. So im not sure if spending £30;on his presets will achieve the desired results. As the 50 only has a 4ohm speaker so options for a speaker upgrade are limited. Jura obviously knows what he’s doing, so I’m tempted but would hate to be let down by my speaker. Have you tried his presets on a 50 watter? Am I going to get that awesome valve sound out of my 50? Is there a 4 ohm speaker that would be a significant improvement on the standard katana 50 speaker? I love my am it’s compact,light and versatile but if I can’t get a decent approximation of a blues junior type sound out of it I’ll have to upgrade Ps love your vids.thanks for helping me on my guitar journey from open mic acoustic strummer to band leader / strat slinger over the years

[@cirisirpula152]

This has been always a bit of mystery for me regarding modelers. For practicing or just playing with Kemper, how do you get the sound? Meaning headphones, power amp+ cab, studio monitors? Edit: saw Justin answering this question in other comment :)

[@capsel22]

kemper would go either into a mixer or directly into studio monitors. You can use it with headphones too.

[@cirisirpula152]

@@capsel22 ye but you could in theory run it into power amp and cab? And of course turn of the cab+mic simulation

[@capsel22]

@@cirisirpula152 yes of course you could. However combo amps are voiced for the speaker they have and would color the sound. Equally cabs also would change the sound. When using a profiler you'd use studio equipment to be as close to the sound kemper produces as you could. But yes in theory you can output to anything with aux or trs inputs.

[@cirisirpula152]

@@capsel22 Makes sense. A lot of people are saying you need guitar cab to get the air moving and thus have more realistic experience. With studio monitors you are kinda losing that i guess. I just have a spark so I dont have experience on big cabs.

[@justinguitar]

Cheers

[@freddysnightmare8391]

young man what is the name of it and model # so i can check it out please thank you

[@shegocrazy]

ok Justin I give up...... what is "model 5FC-A" ????

[@acespark1]

Mess about until it's broken 😁🎼🎸

[@minhtantran4111]

I think Justin forgot about the "Tone" in amp: which blur or clear the sound of your guitar. Right???

[@geoffwatson]

What is the difference between the kemper profiler vs kemper profiler powerhead?

[@apropostt]

The power head adds a 600 watt amp to the head so you can plug into a cabinet.

[@geoffwatson]

@@apropostt Thanks.

[@geoffshaw9728]

What guitar are you playing?

[@bungalowbluesman]

Hi Justin, are you going from the kemper to an interface & DAW, or to a cab & mic?

[@justinguitar]

Kemper > UAD Apollo 8xp interface > Macbook Pro > Genelec mini speakers (Focal twins in the main studio)

[@bungalowbluesman]

@@justinguitar Thanks Justin. I’m a bit confused because i recently sold my Helix after months of frustration trying to get sounds I like using my (decent) monitors (Yamaha HS8). It was only later I realised maybe i’d have been happier using a cab of some sort instead of the monitors. However, you are clearly getting great sounds via monitors. 🤯

[@eeervin3]

Interesting thread, I got the Katana, thinking about upgrading to Kemper, but would potentially keep the Katana as a powered cab? But given the cab simulation in the Kemper I was wondering if studio monitors would work better, but then you say profiler+studio monitors are not great?

[@bungalowbluesman]

@@eeervin3 Hi, I’m prob not a good source of advice on this! I’m sure people get great sounds that way - but i did wonder if the ‘flat’ tones if my monitors were a factor in my frustration. Then there’s the Helix - which I suspect is more ‘fiddly’ than the Kemper. I have a katana & like it - I will prob try a Kemper at some stage.

[@eeervin3]

@@bungalowbluesman thanks man

[@friedrichmandel2574]

I rather economic way to test out various Amp models and settings is the Fender Mustang Micro Headphone Amp ... around €100 and great for practicing ... with a huge WAF (Woman Acceptance Factor) 😉

[@Kianquenseda]

Peavey, and Positive Grid come to mind

[@pgd2202]

Hi Justin. This may be a stupid question, but is there a amp that would be okay for practicing acoustic, electrics and bass guitars?

[@flashtuinmanman]

Yamaha THR

[@michaelforde4373]

Yahama thr30ii

[@richardvannjones9632]

I have a Positive Grid spark that has dedicated settings for bass, acoustic and various electric guitar settings. I haven't tried acoustic, but the bass setting is pretty good for bass guitar, and the amp itself is incredible for experimenting with different effects/amp Sims etc. I have barely scratched the surface of what it can do, and probably never will, but it is very easy to use (even more so than Katana, which I own as well but gets very little use now. Situation would be reversed if I was gigging though - the Katana (50w combo) is great for that. Spark does not have the power. BTW Spark doubles as a really good Bluetooth speaker for streaming music. (I am not endorsed by Positive Grid. If you ever heard my ham fisted playing you would know why...)

[@stuminnis4050]

The Boss Katana series treats electric and acoustic both well, but I’ve never tried plugging a bass into it.

[@emirulman1474]

understanding amp ✋🏽 playing srv licks with no overdrive 👍🏽

[@justinguitar]

:)

[@sigogglin]

The audio in this video seems strange.

[@rareform6747]

always play the amp then guitar . *No crazy simulators*

[@christendomdefenderbeready3251]

😎👍 💪💪

[@Snowy0123]

This videos audio sounds like it's clipping or something is going on

[@vicpnut1]

Uhm minutia …from Merriam-Webster is pronounced:mə-ˈnü-sh(ē-)ə…..or was that an entirely new word I jus dont know? Hehe or a British thing which isn’t common here (USA, New England area)?

[@vicpnut1]

Which kemper is that?

[@kc8923]

Woh! Lost within first 2 minutes. Think im just a technophobe, somehow all beyond me sadly.

[@billwilkinson4012]

Please, as good as you are get to the point.

[@tfarrand652]

Buying a modelling amp as your first amp is a terrible idea..:.

[@justinguitar]

If you keep it rather cheap to start with, It gives you the chance to explore a LOT of sounds for a small amount of money. A multi-effect was exactly how I got to learn which effects I like and which I don't. Beginners looking for an amp should check this one too: www.justinguitar.com/guitar-lessons/beginner-guitar-amp-buyers-guide-b0-037| LievenDV | JustinGuitar Official Assistant

[@69droffig]

Just wondering about the pick ups you’re using in that guitar, looks very versatile.

[@georgemalesky9462]

Thanks!

[@justinguitar]

Many thanks for the super thanks and supporting the channel. It means a lot to Justin and the entire JustinGuitar team. Cheers 😊 | Richard_close2u | JustinGuitar Official Guide & Approved Teacher www.justinguitar.com