DBA Octave Clang noise issue

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DBA Octave Clang noise issue

repoman
I built a DBA Octave Clang from the tagboard vero layout. Very cool sounding pedal, although I am having a bit of noise issue at the more extreme range and was wondering if anyone had some advice how to remedy this if I rebuild more of them to play around with. With the density up about 80% and above with the gain maxed there is a brief hiss like sound that occurs with the note, sometimes it is residual for a little bit after the note decays.  Is this from the diodes used not being the best choice? I used some random Ge diodes that I don't remember the spec of.  

Basically I'm wondering where to start trouble shooting noise.