Korg DSS-1 voice dropping repair

I have a DSS-1 that has a bad voice. It’s always the 6th note played. It is quieter than the others and then it was extremely loud for a while and Now it is dropping out completely. Any idea what component it could be?

There’s no way to tell what component would be causing that without doing some circuit tracing. It will take a tech with an oscilloscope to track that down.

If you could recommend a tech near Houston Dallas or Austin please let me know.

Here’s our listing of service centers - it includes techs in all three of those cities: