Pocket Piano MIDI out is tracking the Analogue Systems rs95e oscillator through the Yarns MIDI to CV.
The Analogue Systems rs95e is frequency modulating the A.S. rs110 Multi-mode filter (MMF).
Each key pressed on the Pocket Piano causes the rs95e to FM the MMF at that frequency.
Sine wave tones from the Pocket Piano are routed to the Signal 1 input of the rs110. When the rs110 'CV-IN Vary' is set to Level 0 the Pocket Piano sine tones are audible. As the CV-IN Vary level of the rs110 is increased, the depth of FM from the rs95e increases and becomes audible.
http://bigcitymusic.com