update:
I've hooked my "scope" (a DIY USB scope kit:
http://www.pdamusician.com/dpscope/overview_se.html ) on the collosalus board and:
when powering it at 9V, I have a triangle waveform from the output of a 4558 and a "weird" clock signal from pins 10 and 12 of the 4013 and I have signal at pins 2 and 6 of the 3007
when powering it at 18V, the 4013 becomes "mute" and voltages are weird: I get 15V at pin 1 and 0V at pin 2... I've tested all (5) of my 4013s and no difference
quite frustrating, actually