Hi - wondering if I could get some help with an issue with an ebs unichorus.. I recently recieved a unichorus in trade off tb, recieved it, it worked great, but chorus isn't my bag I found out so I sold it to another tber... The buyer contacted me saying that the pedal works great when connected to a 9v battery, but he can only get a dry bass signal when hooked up to a power supply. I only ran it on a 9v battery when it was in my possession, so I had no idea about the power supply issue. Any thoughts on what this could be? I'm defintiely going to make it right for the buyer, but any experiences/guesses would be appreciated. Thanks.