good explanation, but still not very practical. that's what i kinda struggle with in all FM explanations - the theory is usually explained "ok" (though even the theory explanation isn't 100% correct. Yamaha's "FM" isn't really a linear FREQUENCY modulation, it's a PHASE modulation - it uses this function: y(t) = A * sin(ωct + I * sin(ωmt)) - where c stands for carrier, m for modulator. so the actual output of the modulator is just plainly added to the phase of the carrier. much simpler to calculate) but that doesn't matter, bcs what it doesn't tell you is what that will _sound_ like. and that's bcs it's extremely hard to tie the theory to the practice. E.g. the common knowledge is that when you have a carrier-modulator pair in 1:1 frequency ratio (which i assume is the scenario shown on the DX11 here) you should ultimately get a sawtooth result. now try to do the math and you'll find that it's extremely difficult to derive that mathematically (i tried, it's difficult 😀 so the theory doesn't really help you predict. if i show you a setting, just with theoretical knowledge you'll have a hard time predicting what the resulting sound would be even in this simplest scenario. the comon "layman" explanation is: "that's bcs in 1:1 it produces all the harmonics. in 1:2 it produces only the odd harmonics." "ok, but why?" "WeLl BcS 1+2=3, rIgHt" 😀yeah, derive that from the original equation. i dare you! 😀That's where the Bessel functions come into play, it depends on the value of the index and generally gets complicated. so there is a big disconnect between the (relatively) simple theory and its very complex implications. the theory is totally unhelpful to the practice. (disclaimer - maybe it's just me being an idiot and missing something obvious - i gave the theory like 1 hour of my time to try and derive things, with the help of THE INTERNET and couldn't. and i'm not particularly great at math or FM programming - i did math for 5 years in college, but don't have a PhD and i program FM sounds on my Yamaha MODX but i'm not doing any super-complex patches, so ... what do i know 🤷‍♂

Thank you for having real information to give.

I was lucky enough to pick up an Arp 1621 sequencer recently but couldn´t get it to trig my 1974 Minimoog. CV & filter control works fine though. It was a relief to find your video, Thanks.

Hello Keith. Omnichord Om-27. I don't have sound in my headphones. I use Ableton 12. Ableton, lets me record, but I don't get sound in my headphones. I use a Scarlett 2i2. And... I hear some white noise(buzz). Why does that happen? And I don't know how to listen to music created in Ableton either Thanks

This is the best (maybe only) strategic approach to FM synthesis that I have seen. Your approach creates a framework for development of any sound.

Do you do repairs? Can I mail to you?

I have 2 MKaS-20’s and the chorus isn’t working at all on either one. I have taken it to 2 places in NYC that said that they couldn’t fix it. What do I do to get the chorus working properly? Please Help if you can. Thanks.

Hola que bateria interna usa este modulo?

My next preset I will call: "beard man taught me that"

Great job, fantastic video.

Thanks for the video. Could you please explain how to make oscilloscopes showing graphs like that?

Help me ,como cargo los sonidos originales luego de cambiarle la bateria interna .Please.

Thank you. Great video :) Made perfect sense. Knowledge increased ✔

repairing mine instead of selling thanks to you and your video! thanks Synthesizer Keith!

Full Bucket Music had just released a free VST of the Omni that sounds very authentic.

People who do not understand the difference between phase and frequency should not be allowed to mislead the general audience by postulating they are the same

This is the American version of Open University?

Hey Keith ,Any slim chance you are able to back up your EProm ? I have an SR with a toasted IC …Seems like a few folks in the same boat :( Thanks for the great vid cheers Craig

How is it possible that when I open the back cover of my omnichord om-27, only the welds are visible?

Very cool. Using the info to program my MPC'a OPx4 synth

aweasome thanks

I figure with fm you just wing it, hopefully create something cool

Just found u channel. Great stuff brother.

How did you clean the audio jacks? Nice video!

Erstaunlich, ich hatte noch nie zuvor von diesem Instrument gehört. Erst beim lesen meiner Bedienungsanleitung von meinem Launchkey bin ich darauf aufmerksam geworden. Ich muss sagen, erstaunlich. Danke für diese Vorführung.😀👍

This was a narcissist try to manipulate, to lose self-respect... Nothing to Do with man or woman

Great video. Subbed.

Does anyone have a diagram of this most powerful device in the world?

This is a fantastic video, thank you! I followed along on the DX100. Interesting how the patch sounds different.

Dear Keith, I would very thankful if you walk me in how to obtain one of those backlight strips for our Virus Indigo we have. The LCD is about to die and we havent been succesful with repairing it. I hope you can help us out! Thank you! H

I plugged the wrong adapter into my Omnichord and something happened..It immediately stopped working. Can it be repaired? It played so well before that mistake.

this was insane .. v good

Great!

Loved your video, great quality and detail. I too was curious about how the breath sensor worked, I've read about it on the service manual, but the description's drawing is "a bit" misleading (maybe they wanted to prevent others from copying it..), but the actual implementation is SO simple, it's basically a membrane microphone used as a pressure/deformation sensor. Also from reading the manual, I imagined it should present some kind of bouncing from the mechanical parts, and there it was: I could see the voltage dips below the resting value when you showed the staccatos. Once again, bravo and thank you for such a great video!

Amazing 👏

I just bought my son a used dx11 and he's only 10 years old and I am not an electronic music player I play guitar but he wants to get into it so I heard a lot about this synth being awesome and now I have somewhat of an idea of how to program some sounds for him that I think he'll really enjoy I really appreciate your content and have subscribed thank you so much

Why would you make a repair video but not even show doing the actual repair? ...You completely skipped actually removing are reinstalling the backlight... Totally defeats the purpose of making a repair video. Total waste of time.

ty

Where do you get the backlight? What the part #?

I have watched a LOT of FM synthesis tutorials, but always end up randomly casting about for cool sounds. I always find them, but it can take a long time. This is the most methodical, clear presentation I've ever seen on how to program a patch in my synth. And I'm not even using a Yamaha synth! Thank you !!!

Glad you repaired the most iconic Elton John piano module to complete satisfaction!

You can save on both sides of the disks. ???

I wonder what the disks were?

I'm looking at a yamaha data filer that also uses quick disks. 😊

I'm wondering if you can use ana akai sampler as a data filer for other 8nsteuments. Such as a qx21 sequencer??

Quick disk?

I have a 1976 Arp Odyssey and some of the white keys stick. If I replace the bushings will that fix my sticky keys? Thank you.

Dang it that was amazing

Thanks for the video. I'm trying to follow using SY77. May I ask which waveform do you use for the carrier and each operatos r?

THANK YOU. I'm currently writing a manual for a DAW and was baffled by the FM in a synth in it because I've pretty much only had experience with linear FM and had absolutely no idea what it was doing. It is INSANE that I've never heard of this distinction in FM types before. There seems to be shockingly little discussion about it online.