Sender Spike SN Zero Synthesizer

SN Zero is a multitimbral 32 voice polyphonic 4-op FM vector synthesizer with 61 keys and support for custom user waveforms — multi-sample instruments as well as single cycle (muti-frame) wave tables.

The main structure of Zero is a patch consisting of:

four operators routed together according to one of twelve available algorithms.
programmable vector cross-fade section that mixes together stereo outputs of all carrier operators.
optional set of output filters (HPF, LPF).
and an optional brickwall limiter/clipper followed by a master output amplifier.

The core of each operator is, then, a frequency and phase modulated waveform oscillator with four phase modulation inputs (three external inputs from other operators and one feedback path) and a single frequency modulation bus. Each operator has also:

three dedicated six-stage envelope generators that can control pitch, filter frequency, filter drive, amplitude, and feedback.
multi-mode filter with modulatable frequency and drive.
modulatable amplifier.
a single, nevertheless quite feature-rich, LFO that can be simultaneously routed to modulate pitch, filter frequency, amplitude, and/or panorama.
plus plethora of other minor, but essential, features.