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Is this possible?

If so how would one do this?

A potentiometer with each transistor's base on either side?

That's an interesting question, I'm looking forward to the responses.

everything goes in and out through the emitter. you can choke an emitter off with 10M resistance so that no current will flow. but your question as it relates to guitar pedals has some other problems before it can be reality. how do you connect the bases together without decreasing the input impedance of the transistor? you don't really. on some pedals it does not matter much to have an impedance half what it was. on some pedals it does matter. you would be at an advantage to duplicate the circuit and just blend the two outputs. use the same exact caps for both so that the time delay will be pretty much the same on both outputs. by time, I mean phase. easier to understand it as a cap being a very very short delay.

there is also the issue of connecting the bases together at the input of the pedal. that gets right back to the first problem. solution is to use a buffer split into two more buffers with a TL074. you can use the last opamp in that quad to buffer the output after a passive blend knob.

ˆNice

Why isn't anything ever as simple as I thought it'd be...

It's not a flexible but switching between transistors is a far more simple setup if you want to build some versatility into a pedal.