Feb 18: MS20 Modulation by C C O published on 2018-02-28T21:23:19Z I wanted to see what I can squeeze out of my old MS20 using some external modulation sources. The patch is pretty simple, but effective. To gate the MS20 VCA, a Cwejman CTG-VC is routed to initial gain on the MS20. A dummy plug to the trigger input makes sure the envelope does nothing when the keys are played. The CTG-VC is cycling and receives reset triggers from a RG6. The internal routing on the RG6 to modulate the clock with the random saw is used to create the bursts. Furthermore, the inverted random saw is used to modulate the attack and decay times of the CTG-VC - so that the cycling envelope gets faster as the RG6 accelerates. For the filter modulation, a VCA4MX is used to route several sources to the MS20 total input. Firstly, the high S/H out of the RG6 is used. Secondly, an audio rate sine from a QMMF4 creates some FM - it is gated from the CTG-VC on the VCA4MX. Thirdly, a PH4 is used for a slow sine LFO. Its frequency is modulated by the RG6 random saw to also speed up with the rest of the patch. And finally, the ring modulation out of a D-LFO (with one LFO set to slewed S/H and the other to sine, both rather fast) creates some noisy modulation on the MS20 filters. The normal S/H out of the RG6 is further used to modulate the D-LFO sine, and another out of the PH4 to modulate the D-LFO slewed S/H. For the recording, I mainly play with the VCA4MX, MS20 filter frequencies, oscillator octave settings, and obviously the keys. It’s a vintage MS20 with the MK2 filter, if anyone cares :) Some EQ, compression, reverb and delay in Ableton to bring it all together. Hope you enjoy it and cheers!