> Can anyone here tell me what the four circuit boards are for that are > underneath the keyboard in the perfomer All right, I just scanned and posted the schematics for these 4 boards (Chorus Ensemble section) Take a look at http://home.debitel.net/user/jhaible/jh_Crumar_Performer_Ensemble1.gif The clock says 2:25 am - enough for today ! JH.