synths - Faust Libraries

# synths.lib

This library contains a collection of synthesizers. Its official prefix is `sy`.

#### References

- https://github.com/grame-cncm/faustlibraries/blob/master/synths.lib

### `(sy.)popFilterDrum`

A simple percussion instrument based on a "popped" resonant bandpass filter. `popFilterDrum` is a standard Faust function.

#### Usage

    popFilterDrum(freq,q,gate) : _

Where:

- `freq`: the resonance frequency of the instrument in Hz
- `q`: the q of the res filter (typically, 5 is a good value)
- `gate`: the trigger signal (0 or 1)

### `(sy.)dubDub`

A simple synth based on a sawtooth wave filtered by a resonant lowpass. `dubDub` is a standard Faust function.

#### Usage

    dubDub(freq,ctFreq,q,gate) : _

Where:

- `freq`: frequency of the sawtooth in Hz
- `ctFreq`: cutoff frequency of the filter
- `q`: Q of the filter
- `gate`: the trigger signal (0 or 1)

### `(sy.)sawTrombone`

A simple trombone based on a lowpassed sawtooth wave. `sawTrombone` is a standard Faust function.

#### Usage

    sawTrombone(freq,gain,gate) : _

Where:

- `freq`: the frequency in Hz
- `gain`: the gain (0-1)
- `gate`: the gate (0 or 1)

### `(sy.)combString`

Simplest string physical model ever based on a comb filter. `combString` is a standard Faust function.

#### Usage

    combString(freq,res,gate) : _

Where:

- `freq`: the frequency of the string in Hz
- `res`: string T60 (resonance time) in second
- `gate`: trigger signal (0 or 1)

### `(sy.)additiveDrum`

A simple drum using additive synthesis. `additiveDrum` is a standard Faust function.

#### Usage

    additiveDrum(freq,freqRatio,gain,harmDec,att,rel,gate) : _

Where:

- `freq`: the resonance frequency of the drum in Hz
- `freqRatio`: a list of ratio to choose the frequency of the mode in function of `freq` e.g.(1 1.2 1.5 ...). The first element should always be one (fundamental).
- `gain`: the gain of each mode as a list (1 0.9 0.8 ...). The first element is the gain of the fundamental.
- `harmDec`: harmonic decay ratio (0-1): configure the speed at which higher modes decay compare to lower modes.
- `att`: attack duration in second
- `rel`: release duration in second
- `gate`: trigger signal (0 or 1)

### `(sy.)fm`

An FM synthesizer with an arbitrary number of modulators connected as a sequence. `fm` is a standard Faust function.

#### Usage

    freqs = (300,400,...);
    indices = (20,...);
    fm(freqs,indices) : _

Where:

- `freqs`: a list of frequencies where the first one is the frequency of the carrier and the others, the frequency of the modulator(s)
- `indices`: the indices of modulation (Nfreqs-1)

## Drum Synthesis

Drum Synthesis ported in Faust from a version written in Elementary and JavaScript by Nick Thompson.

#### Reference

- https://www.nickwritesablog.com/drum-synthesis-in-javascript/

### `(sy.)kick`

Kick drum synthesis via a pitched sine sweep.

#### Usage

    kick(pitch, click, attack, decay, drive, gate) : _

Where:

- `pitch`: the base frequency of the kick drum in Hz
- `click`: the speed of the pitch envelope, tuned for [0.005s, 1s]
- `attack`: attack time in seconds, tuned for [0.005s, 0.4s]
- `decay`: decay time in seconds, tuned for [0.005s, 4.0s]
- `drive`: a gain multiplier going into the saturator. Tuned for [1, 10]
- `gate`: the gate which triggers the amp envelope

#### Reference

- https://github.com/nick-thompson/drumsynth/blob/master/kick.js

### `(sy.)clap`

Clap synthesis via filtered white noise.

#### Usage

    clap(tone, attack, decay, gate) : _

Where:

- `tone`: bandpass filter cutoff frequency, tuned for [400Hz, 3500Hz]
- `attack`: attack time in seconds, tuned for [0s, 0.2s]
- `decay`: decay time in seconds, tuned for [0s, 4.0s]
- `gate`: the gate which triggers the amp envelope

#### Reference

- https://github.com/nick-thompson/drumsynth/blob/master/clap.js

### `(sy.)hat`

Hi hat drum synthesis via phase modulation.

#### Usage

    hat(pitch, tone, attack, decay, gate): _

Where:

- `pitch`: base frequency in the range [317Hz, 3170Hz]
- `tone`: bandpass filter cutoff frequency, tuned for [800Hz, 18kHz]
- `attack`: attack time in seconds, tuned for [0.005s, 0.2s]
- `decay`: decay time in seconds, tuned for [0.005s, 4.0s]
- `gate`: the gate which triggers the amp envelope

#### Reference

- https://github.com/nick-thompson/drumsynth/blob/master/hat.js

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