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# Virtual Analog Synthesizer
## Description
An example of an [analog modeling synthesizer](https://en.wikipedia.org/wiki/Analog_modeling_synthesizer) which recreates vintage synthesizer sounds by modeling the original electronic circuitry. A full manual for this type of circuit model can be found at [Virtual Analog Synthesizer Manual](http://synthpalace.com/SynthPDFs/minimoog%20model%20d_manual.pdf)
## Parameters
| Function | MIDI CC | Module | Type | Notes |
|-----------------------------|------------|-------------------------|--------|----------------------------------------------------------|
| Tune | 47 | 1 - Controllers | knob | Master tuning |
| Glide | 5 | 1 - Controllers | knob | Portamento time |
| Modulation Mix | 48 | 1 - Controllers | knob | Modulation mix between OSC3 and Noise |
| | | | | |
| Oscillator Modulation | 22 | 2 - Oscillator Bank | switch | Enable modulation control of OSC frequencies |
| OSC 1 Range | 23 | 2 - Oscillator Bank | knob | OSC 1 range |
| OSC 1 Detune | 24 | 2 - Oscillator Bank | knob | OSC 1 detuning |
| OSC 1 Waveform | 25 | 2 - Oscillator Bank | knob | OSC 1 waveform shape |
| OSC 2 Range | 28 | 2 - Oscillator Bank | knob | OSC 2 range |
| OSC 2 Detune | 29 | 2 - Oscillator Bank | knob | OSC 2 detuning |
| OSC 2 Waveform | 30 | 2 - Oscillator Bank | knob | OSC 2 waveform shape |
| OSC 3 Range | 33 | 2 - Oscillator Bank | knob | OSC 3 range |
| OSC 3 Detune | 34 | 2 - Oscillator Bank | knob | OSC 3 detuning |
| OSC 3 Waveform | 35 | 2 - Oscillator Bank | knob | OSC 3 waveform shape |
| OSC 3 Control | 9 | 2 - Oscillator Bank | switch | OSC 3 as a control signal or as an audio source |
| | | | | |
| OSC 1 Amp | 26 | 3 - Mixer | knob | OSC 1 gain |
| Osc1 mixer switch | 12 | 3 - Mixer | switch | OSC 1 enable |
| OSC 2 Amp | 31 | 3 - Mixer | knob | OSC 2 gain |
| Osc2 mixer switch | 14 | 3 - Mixer | switch | OSC 2 enable |
| OSC3 Amp | 36 | 3 - Mixer | knob | OSC 3 gain |
| OSC3 mixer switch | 17 | 3 - Mixer | switch | OSC 3 enable |
| External Input amp | 27 | 3 - Mixer | knob | Extrenal input gain |
| External Input mixer switch | 13 | 3 - Mixer | switch | External input enable |
| Noise Amp | 32 | 3 - Mixer | knob | Noise gain |
| Noise mixer switch | 15 | 3 - Mixer | switch | Noise Enable |
| White/pink toggle | 16 | 3 - Mixer | switch | Noise pink/white |
| | | | | |
| Filter Modulation Enable | 19 | 4 - Filter | switch | Enable modulation control of the filter cutoff frequency |
| Keyboard Range | 38 | 4 - Filter | knob | Add keyboard control of the filter cutoff frequency |
| Cutoff Frequency | 74 | 4 - Filter | knob | Filter cutoff frequency |
| Emphasis | 37 | 4 - Filter | knob | Filter Resonance (Q) |
| Amount of Contour | 39 | 4 - Filter | knob | Amount of envelope generator |
| Attack Time | 40 | 4 - Filter | knob | VCF envelope generator attack time |
| Decay Time | 41 | 4 - Filter | knob | VCF envelope generator decay time |
| Sustain Level | 42 | 4 - Filter | knob | VCF envelope generator sustain level |
| | | | | |
| Attack Time | 43 | 5 - Loudness Contour | knob | VCA envelope generator attack time |
| Decay Time | 44 | 5 - Loudness Contour | knob | VCA envelope generator decay time |
| Sustain Level | 45 | 5 - Loudness Contour | knob | VCA envelope generator sustain level |
| | | | | |
| Decay | 20 | 6 - Keyboard | switch | Enables using the decay stage as a release stage |
| Glide | 65 | 6 - Keyboard | switch | Enable portamento |
| Pitch Wheel | pitchWheel | 6 - Keyboard | knob | Pitch Wheel |
| Mod Wheel | 1 | 6 - Keyboard | knob | Modulation Wheel control |
| Sustain | 64 | midi sustain foot pedal | switch | Note sustain, preempts the VCF/VCA release stage |
| | | | | |
| Master Volume | 7 | 5 - Output | knob | Master volume |
## Building the Example
The faust code (.dsp) in this directory has been compiled using `faust2sam` into `virtualAnalog-sam`
```
% faust2sam -midi virtualAnalog.dsp
```
The result of this compile is a zip file `virtualAnalog-sam.zip` which contains the following three files:
- `fast_pow2.h`
- `samFaustDSP.cpp`
- `samFaustDSP.h`
These 3 files should be placed into the directory `sam_baremetal_framework_core1/src/faust`
In addition there is a header file that is common across all cores called `audio_system_config.h`. In this file the following pre-processor variables should be set in the following way. The example below indicates that a Faust algorithm will only be running on Core1 and that Core2 will be simply passing audio to the codec.
```
#define USE_FAUST_ALGORITHM_CORE1 TRUE
#define USE_FAUST_ALGORITHM_CORE2 TRUE
```
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