Uhm, if i could get my brother to get my electric guitar + amp i could probably sample some feedback to you - distortionfeedback - and loads of it..
I could also fix the little tone-control on it, since when i built it i didnt wanna spend to much time with the electrics since i was really late with it and had to perform for my school with it.. so i just made the basic - it features a cutoff + resonance control acctually
synthesizer-guitar