I've been putting together my own od circuit when I noticed something a bit odd: when I added the master pot (I tried 22K, 100K, 500K and 1M) it actually acts as a volume pot of a tube amp (meaning that u have to crank it to get overdrive). Well, I know this is a common thing and in most analog fxs I used or built it is so. But in this particular case the impact on the sound is huge! I get little to no overdrive with the master at low levels even when the circuit's gain is at max. Then, when I bring the master level to 10/10 I get the full ammount of distortion... yes, that's ok, but the volume gets too high and basicly makes the thing unusable in an fx chain.
Is there a way to make a proper master controll without it acting as a gain pot at the same time?
PS: just screwing around I measured my amp's input impedence, it' 1M. And then I realized that by putting any master pot at the fx's output the impedence is 0 ohm at min level and would go as high as 500K if I used a 1M pot for instance. The circuit is at it's best when there is no master pot at all and the signal is fed to the amp straight from the output cap... hmmm hmmm