Stevie Wonder recorded many of his parts through a Mu-Tron which sound like an automated wah. I noticed that there are two tracks on "Songs in the Key of Life" where the drums are being put through a mu-tron on the toms and snare. ("All Day Sucker" and "Black Man") What I can't figure out is how they set that up for MORE THAN ONE PIECE ON THE KIT. The Mu-Tron takes only ONE quarter inch cable. I'm still trying to figure out how they put the mutron on ALL the toms. Any ideas???