I'm a mere buffoon, a soldermonkey, but here's what I know about leaky transistors:
Q1 and Q3 in a Tone Bender MKI, as @Stickman393 said, or it won't work at all/sound bad. This circuit is supposed to be gated.
Q2 in a Tone Bender MK1.5 so Q2c is at about 8V, otherwise it will just be a dark...