VCO with Sync, FM Kind of Mods.. Looks this is for FM via Env Follower..
just check matrix for more.. but it’s pretty obvious..
* Accepts instrument level and line level inputs
* Frequency and waveform controls in the VCO section
* VCO can be frequency modulated by the audio signal
* Envelope follower and mix controls for even greater sonic enhancement
* Housed in the super-durable, classic Moogerfooger enclosure”