Ok, so after reading a lot, studiing lots of schematics, and thinking a lot about all this, here I come, here it is, my first DIY distorsion !!! Really simple, in fact. A neutral op amp stage. 3 resistors, 2 caps, 1 opamp, 2 leds. Believe it or not, it sounds better to my ears than my Jacques Tubeblower. I found MY sound, the sound I was looking for. I don't really understand why all the OD are that complex. Why they all have a tone control after the amp stage, not before. Before is better to control OD tone, I find. Anyway, exit my Tubeblower, welcome to my first DIY pedal on my pedalboard !! Not finished yet, but that's details.I found the tone, the rest is details.