After auditioning half a dozen treble bleed candidates, I thought I'd work smarter not harder on getting what I wanted from it. So I learned how to model a guitar circuit in LTSpice and figured out what the different parameters do to the frequency response of the RC network. Now I've got graphs to share, showing what changing the values of the capacitor, the parallel resistor, and the series resistor does. This definitely helped me zero in on what to change as I used my ears to test each RC network in my guitar. It's kind of a generic model so I won't get into recommending any specific values. Every guitar is different, every player's pair of ears is different. But this guided me in landing on a treble bleed I'm super pleased with. I definitely heard a LOT of damn stinkers during this process and can see why people who don't methodically figure out what works in their guitar wind up just deciding that treble bleeds suck and they hate them. Red represents full volume - all the options overlap here because the treble bleed is not in effect at full volume. Blue is volume turned down about 2/3 of the way (with an audio-taper volume pot), and green represents volume turned down to the lowest useful setting - almost-off but without losing legit, listenable signal. First, here's what changing capacitor values does: Larger values shift the resonant peak to lower frequencies and make the peak higher. The next two images after this include a single capacitor value, chosen to line up with the full-volume resonant peak. Next, here's what changing (Duncan-style) parallel-resistor values does: Smaller values result in less lows being blocked from the bleed, so it turns the treble bleed into a bit of a treble-and-everything-else bleed. It has the effect of bringing all the frequencies closer to the level of the resonant peak - as well as lowering the peak, both of which mellow the peak treble intensity but you can see how this makes the volume taper unpredictable: Finally, here's what changing (Kinman-style) series-resistor values does: Larger values block signal from being bled off, reducing the height of the resonant peak and widening the remaining treble peak's band. This also mellows the peak treble intensity in away that is slightly different (rounder, softer) than the parallel capacitor does, and in a way which keeps the volume taper sounding pretty normal. Stand by for graphs of commonly-recommended treble bleeds, as well as the one I settled on after auditioning about 10 more after the first half-dozen random choices.