ROG Mockman 2.0 - Gain control?

[Elijah-Baley]

Hello.
I'm searching for a long time a tiny distortion circuit to build on veroboard, or in case on perfboard.
I found the Mockman 2.0 by ROG, maybe not so famous, but I could like it.
http://www.runoffgroove.com/mm2.html

Schematic:



I didn't build it, yet.
I just want to make it more versatile adding a gain control. I'm simulating it with the a software I have.
I see a suggestion about it, using a 100k linear pot in line after the input cap, but I'm afraid it doesn't good, I'm not sure, of course. (But I'll try it, anyway).

How we can see it use two inverting input stages, and I know I can decrease the gain with less resistance in the two feedback opamp.
Initially I thought about the first stage, because I guess it work a bit better as gain stage than the second stage. I could add a fixed small resistor to get at minimum setting a clean or slitghly overdrive sound and not cut completely the volume, and to use in series a 1M pot.
It could even work like this, but I know in the first stage the 10k input resistor and the 1M resistor in the feedback set the impedance. I don't know if I'll mess up the impedance with this mod. Or maybe yes, but that's ok. I really don't know.

I'd like get some clarity, please.

Thanks!

[Elijah-Baley]

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Double post. Oops.