Korg Mono/Poly

Hello Alan

> Many might disagree with me her and I would like to say be very careful 
> while working this way but I often find that if no oscilloscope is 
> available that simply testing the signal path with a wire attached to 
> the tip of an audio jack will tell you allot.
I do this all the time, the way you are describing (and I think most 
technicians do it that way). Use only extremely simple speakers or 
headphones for this, because there may signal transitions happen, which 
can kill tweeters or delicate headphones! I have a set of old car hifi 
speakers on my workbench for this.

Florian