Korg X-911 Guitar Synthesizer Repair - Synthchaser

[@justindpeak]

Man, love how you go in depth on your videos. I hope you realize how appreciated your videos are!!

[@daveogarf]

I second that!

[@mima85]

2:45 - It's easy to fix that "trumpet" preset: just rename it "duck" and you're good to go :-D

[@Multi_ToBi]

I just started revitalizing old synths - couldn't do it without videos as brilliant as yours...thank you so much!

[@zmix]

I was fascinated by the X-911 as a kid.. nice to hear it again.. PRO TIP: you could have plugged *any* synth into the 'guitar input' jack and used that to verify the pitch/voltage and trigger circuits..!

[@Synthchaser]

You are absolutely correct, and I did do that, just not in the video. The guitar interface (audio to CV and trigger) and the oscillator/voicing (CV & trigger to audio) are two separate stages. For troubleshooting and repair of things in the CV to frequency stage (as I was working on in this video) it's helpful to remove any variables the guitar interface may introduce and control it with CV/gate directly. This was one of 5 units I just repaired/refurbed. All of them got tested and calibrated being controlled through CV/trig on the back AND the guitar interface/audio input on the front. This video was about the repair of a specific problem, not a comprehensive servicing video of this synthesizer.

[@zmix]

@@Synthchaser certainly, great to see it, regardless.. thanks for your documentation!

[@shahruzmoshtael]

Very cool!

[@SCOTTYD2031]

Big thumbs up. My favorite videos are yours!

[@marcbrasse747]

Very interesting. Still trying to get my head around the problem though. I understand the strong peak signal in the faulty components masks the oscillator signal and since it has a constant frequency it comes across as a stuck pitch. Why is the output however “corrected” giving the mixed signal a normal amplitude / volume? Something down the line must thus normalize that high signal. It’s probably something relatively basic for you but I’d appreciate a short explanation. 😁

[@scottlarson1548]

Oh, this synth has a "kazoo" preset.

[@Heathcliff_hensel]

yeah either a kazoo or the sound baby alligators make.

[@homestarserviette1030]

There’s one trick I’m wondering if it would sound good on this, I wonder what a basic cv signal recorded to a tapeloop would sound like being ran through this

[@JCBudro16]

warbly