Donner below are some more (critical) thoughts on the 4H and a question of whether or not this could be changed/updated/fixed...
While I can dial in some really great sounds on the 4H, my main complaint with the pedal is that all the "good" sounds (for me) are contained in very small parts of the sweep of the knobs -- specifically...
Volume -- can't put it above 11 o'clock or so without blowing out my eardrums... can this pot be switched to something with a different sweep (log/linear/etc.) so fine tuning in the "slightly above unity" range can be achieved?
Drive -- above 12 o'clock I seem to loose most of the clarity and dynamics of the pedal and just get overwhelming distortion that turns chordwork muddy. Again, is there a different pot value or sweep that will allow more fine tuning in the lower end (fully CCW to about 11-12 o'clock)?
Note I'm still working on dialing in tone and treble but here are my initial thoughts...
Tone -- I pretty much found this to control the fatness/brittleness of the pedal. Tone low = brittle/thin and Higher = fatter. I pretty much only find this sound good above 2-3 o'clock up to fully cranked.
Treble -- anything above 12 o'clock makes my ears bleed with my preferred settings fully CCW to about 10 o'clock.
Overall I feel like the 4H is awesome but provides SO MUCH sweep on the various knobs that the majority of the sweep doesn't really sound good and the broad sweep makes it difficult to dial in settings as very small changes in knob position result in very large changes in sound. So Donner -- could something be done (ex: swapping pots) to make this a little friendlier when dialing it in?