Ibanez WH10 tone suck

[Rockhorst]

I'd like some input on this one from here if possible. I posted it over at DIYSB as well, seems to best fit the Open Discussion part of the forum. Take a look at this schematic if you can. Any clues why this sucks massive high end and volume in bypass? The pedal doesn't suck tone with another buffer in front of it and I'd like to understand why. I've removed those 2n2 caps and tried raising the input impedance by bumping the 510k to a 1M, but with little effect. My next bet would be to remove/or lower the 220R series resistors at the input, but I doubt that will do much. My thoughts are drifting more towards the input stage not being able to drive both the clean signal and the wah signal. It's being split in two/three and later mixed together when the effect is on.

The fix, in any case, is easy: put another buffer in the enclosure, either at the input or between clean and wah signal to separate the two. I'd just like to understand it a little bit better.