Crate V5 "MODS" will commence!

[jim p]

That pedal board op amp circuit will work fine with up to a 36 volt supply. You could run I off the same supplies in the V5 if you returned the -Vee pins to the -18 volt supply and replaced the virtual ground with ground. A higher supply voltage will give you more clean headroom.

I did a spice model of the mad beans active tone control pedal above and see if you want you can add a mid control pot. With the contour control being the bass, the process control the treble if you change R15 to a 10 k resistor and add a 50k pot in series to the inverting input of IC1B you have a mid control also. You can also change the cross over points of the tone control by changing the value of R11 for the high frequency and R14 for the low frequency a lower resistance value equals a higher frequency a lower value a lower frequency. The mid control will allow you to scoop or boost the mid frequencies.