I have a new 2003 EH Big Muff Pi. I play through a 60’s Strat re-issue with tex mex pickups well shielded. Amp is a new VOXAC30.
Every time I try and use my Big Muff, upon ring out sustain it oscillates a lot. It also has a weird almost notched frequency when the tone is past 12 o’clock thats a little annoying.