I have been using my FM4 for years and have always been happy. Recently I was using it in a setup that I wanted to calibrate level (using a sine tone). I noticed 2 things that bother me;
- When the mix control is fully turned down and no processing is happening there is a small amount of distortion being added to the signal.
- With this setting there is also a level difference when the effect is turn off/bypassed, which is the effect of the distortion being added when the effect is engaged.
I always read that the bypass on these pedals was a "true bypass". The signal going in and out of the pedal is not peaking so I am quite sure I am not adding the distortion to the signal path. I know the pedal distorts when you overload the input.
Has anyone else noticed this? I have attached a recording showing the issue.