A couple of things?
Noise Test?
1...Is the amp noisy? at all with the amp open on the bench, running in Overdrive guitar volume (off) and you set input volume noon and both OD drive and OD levels at 3 o:clock (cranked) and Mstr @ noon How bad is the the hiss/noise? compared to the clean channel?
You can also check sensitive parts of the board if you again with the amp cranked run your hand down across the top of the board (careful not to touch it) are there any sensitive parts of the board that's picking up outside interference?
Let me know what you find?
2.Type of noise?
Does the sound your hearing sound like a kind of intermodulation distortion (Riding on or under the note) or is it blocking distortion or could it be simply too much bass in the preamp somewhere sawtooth-ing your low end at certain frequency's?.. Any one of these could be what you describe? I cannot tell by the recording.
Your clean channel sounds OK to me!
Still looking at your pictures
![Wink :wink:](./images/smilies/icon_wink.gif)
Tony