I have a Fender Starcaster guitar effect pedal - a chorus. My chorus pedal clips (overdrives) when I strum. I did have a 9.6 volt power supply powering the chorus pedal for months before I got the correct 9 volt power supply for it. The 9.6v power supply had the correct ma and polarity and everything, it was just .6v ...
[...] Digitech PS200R Power Supply for RP50/80, BP50/80, XAS-DD, XAS-EC … This power supply works with the current DOD FX series, the T2 Tuner, the TEC4 and TEC4X, the VOTec, ACOUSTec and the BASSTec. Specs: 9.6 volts D.C, [...]