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# POLY-1 hybrid polyphonic synthesizer
WORK IN PROGRESS!
USES KICAD 6.99.
This is a hybrid (analog and digital) polysynth using the classic subtractive
synthesis method. Features include the following (an asterisk \* means the
feature is provided in digital, otherwise analog):
- Fully controlled by MIDI, plus front panel to edit settings (keyboardless)
- Monophonic control of pitch, modulation, and gate by CV
- Monophonic output of CV
- Up to 16 voice boards:
- Dual analog VCOs per voice providing:
- Square, sawtooth, triangle
- PWM by LFO (including symmetry modulating for triangle) on both
- Fully variable FM by LFO on both
- Fully variable FM by envelope on oscillator two
- Hard sync from oscillator one to oscillator two.
- Digital tuning of VCOs (\*)
- [SSI2144](https://www.soundsemiconductor.com/downloads/ssi2144datasheet.pdf)
quad pole lowpass filter with switchable pitch tracking, envelope modulation,
LFO modulation at two fixed strengths (LFO amplitude is also variable), and
resonance as a function of pitch (\*).
- Voltage-controlled amplifier combines audio, noise, envelope, and optional
LFO.
- Dual digital envelope generator (\*) generating independent envelopes for
- Polytimbral - patches can be assigned to MIDI channels (global LFO and VCA
excluded)
- Global digital LFO providing:
- Sine, square, sawtooth, triangle, noise
- Internal modulation against a second LFO (not routable to voice boards)
with same shape options

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