Vintage Synth Repair

>Hello, everyone! I have found an old yamaha CS01 synth in a pawn shop
>and it worked fine so far until I borrowed to a friend and he had the
>really stupid idea to hook a walkman into the breath control, hoping
>to get some weird filter effects out of it and of course screwed it
>all up! Long story short - it now has a flaw/feature Every time (and
>only then) when I flip that switch below the mod/pich wheels to vcf
>modulation and the mod wheel is set to 0, the filter(?) sounds gritty
>and distorted which sounds kinda cool but I want to fix it now because
>it's DEFECT and not a mod of mine! So where should I look? What should
>I look for? I have a multimeter and nuff experience to replace some
>caps and resistors and such. Just need someone to show me where to
>start and what to look for.

The breath controller input probably expects a resistance to be applied, not 
a voltage- I'd imagine it blew the first transistor, op amp, or whatever 
after the breath controller input.  You'll likely need schematics to figure 
it out.

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