What are the differences between the 5 & 6 knob Xerograph Deluxes? I know the 6 knob has the addition of the Expression knob & a dedicated stomp to activate the envelope... does that mean the 5 knob is always in envelope effect?
IIRC, on the 5 knob, it’s always envelope unless/until the EXP has something plugged into it. The EXP In also acts as the switch between env and expression-controlled.
I have the 5 knob XD. The Expression pedal just changes the Frequency Knob on the fly. Plug in the expression, and now it overrides the Frequency knob. It's still an autowah, no manual sweep, but now you can change the frequency on the fly. It's a very narrow sweep range, but it works. If you got something like the
EHX CNTL Knob pedal, you could toggle between 2 different frequency "favorites" and not a bad way to swap between settings.
I've thought about getting one, but scored a 6 knob on the last drop. Probably going to keep both, one set for classic wah and another set for synth.
Just to clear this up: on both versions, the Frequency knob and expression pedal are always active, and they add together with the envelope democratically (any one can sweep nearly the full frequency range on its own, and the cutoff frequency is set by the addition of all three).
The expression pedal is never switched off (if you wanted to switch it "off", just set the expression pedal heel down - that will be the same as if it wasn't connected). The reason you'd want to have the expression pedal and envelope active together is that you can do unique and interesting things by combining them.
The Frequency knob doesn't get overridden, they work together. So you can set the bottom of the sweep/minimum frequency with the Freq knob and on the newer version (6 knob) you can set the maximum frequency with the Exp knob. If you're only getting a narrow sweep range, I'll be happy to help troubleshoot, but I'm guessing it's because the Freq knob on the pedal is set high.
To answer the original question, the 5-knob version is the original, released in 2011. The 6-knob version is the redesign, released in 2016.
The newer one has
-Exp knob which is useful if your expression pedal doesn't have its own top end limiter knob. Using the Freq and Exp knobs you can define a range to sweep through that's as wide or as narrow as you could want
-power jack up top (wasn't possible to fit with the switches used in the original)
-redesigned input and output circuitry for low noise, no electrolytic caps in the audio path
-knob ranges reconfigured to make it a lot less fiddly to dial in the sounds you want
-the exp switch turns the envelope off (but keeps the expression pedal active!) so you can switch to a deep dubby sound without auto-wah, and back without losing the position of your Sensitivity knob