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Looks great

After making this I decided that only 3 different duty cycles were not enough so I upgraded it to 128 different cycles, so every possible cc value will now change the duty cycle.

Here is a recording of it: http://chipmusic.org/tmtgr/music/4bit-synth-duty-test

All I did was change the update_duty_cycle function to this:

void update_duty_cycle()
{
    OCR1B = OCR1A * (duty_cycle / 128.0f);
}

It's a called a decoupling capacitor.

Ok I need to be honest, I paid $5 no the minimum $2, I just wanted to be part of this thread

They really do know nothing.

Did it today and it works
I decided to ground the unused inputs just to be safe, but it seemed to be ok without grounding them.

Couldn't you just pan both channels center using your mixer if you're doing it live?