Big Muff tone + Midrange control for basic OD?

[pott]

I figured that'd leave A LOT of scope for a pedal. Especially with a bass trimpot to tailor the sound to your amp.

Is that possible, or even a decent idea..?

[John Lyons]

Sure, why not?

John

[TELEFUNKON]

bump 

[Mark Hammer]

The thing to keep in mind is that these will likely be passive controls, and passive controls work by selectively "bleeding" certain portions of the spectrum.  That has several implications.  One is that the tone shaping needs to come after the primary clipping portion of the circuit so that tone settings do not interfere with the likelihood of getting a certain intensity of clipping at a specific drive/gain setting.  The second is that, unless you follow them with some sort of "gain recovery" stage, such passive controls will invariably mean that your maximum output level is reduced.  Depending on the specific circuit, that may or may not be a problem.  Some pedals have such a hot output signal that you can chop their amplitude by half or more and still have an extremely "healthy" output level.  In other cases, the output level is severely compromised by the tone control and the signal level needs to be boosted again to compensate.  The poster child for this is the aforementioned Big Muff Pi, which has a simple tone control, but loses enough signal in the process that the signal level has to be brought up again with a single transistor stage.  SOME designs will survive a BMP tone control followed by a midrange control of some sort, but not all will..