Tonepad MXR Envelope Filter a bit distorted

[juan_felt]

Hi everyone!

So, I tried this effect http://tonepad.com/project.asp?id=4 and it sounds great, though it's a bit distorted in some settings. Maybe this is a common thing and it has an easy fix!

Thanks in advance!

[PRR]

> Maybe this is a common thing

Apparently not.

DC voltages on both sides of R4, and on pins 3, 4 and 2 of IC1.