Doepfer a-119. Maybe not the coolest module on the market. But i have plans for this little friend. Bought it used. "module a-119 (external input / envelope follower) is designed to allow external audio signals to be integrated into the" (from doepfer home page) modular synth. As delay i use joyo analog delay.
Testing/documening my bartonmusicalcircuits (bmc21) full wave dual rectifier. "this is an all analog synthesizer module used to alter the timbre and create new harmonic content. ". Sound:1. Sine wave not going throught rectifier2. Sine wave though rectifier3. Triangle though rectifier4. Square through rectifier5. Saw through rectifier. An lfo is modulating the bias.
A less harsh, almost tickling of static pops from the right-hand side of the fm radio dial, interspersed with harsh interference (source unknown). Recorded from a digital tuner.