Hi there... 

I know this is a very old project.. but Im very interested in doing this for our anual chip music meeting in Spain (small meeting, in small touch..).

I know some (basic) electronics (im building a modular synth :) )... 

so Im wondering if you have any more info you could share about this like schematics... somewhere in the post you mention you have tried several different voltage values with success but Im still a bit scare on it... can you let me a safe range I could work :)?

Cheers!!