I have similar problems with sequencer mode (hold single and multi at the same time).
To test, just place patch A-5 Ti|Bell in the first empty sequencer mode slot (make sure all your other channels in seq mode are set to init).
A-5 plays without crackles in single mode, but in seq mode the crackles are loud and clear.
I've had these sorts of problems with mine since day one, which makes it useless for anything other than single mode, which is how I use it most often.
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