L-1 Discrete TZ VCO -- Through-Zero FM vs. Not Through-Zero FM 

Still waiting for the progress of this one. 😉 I have 16HP reserved for it.

No, the noise output is separate thing. I just decided it will be useful into the VCO.

@@xrexo265 Sub is suboctave output. Selectable by switch at the back - 1 or 2 octaves lower. Square wave.

@@xrexo265 thru-zero modulates frequency, not shape. Sub out is made from main wave using a divider. So it follows main wave frequency modulations.

@@xrexo265 Yes, but Sub output can produce only square, no other shapes.

​@@L-1 There is so much space on the front panel for the sub switch to be located on the back. Probably!!! ^^