The original Life Pedal uses Russian diodes that look like D9K.
D9K have a red ring that marks the anode rather than the cathode, which may have caused some confusion with some clone PCBs that ended up indicating wrong polarity.
ok now only one more question to ask what transistors can be substituted for the ones listed like the 1n5817, 2n5087,2n5089, and bs170 op amp ok maybe 2 questions how about the pots A100k B50k, what if i used A250k and B10k