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151 lines
3.1 KiB
Plaintext
151 lines
3.1 KiB
Plaintext
---
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title: Audio effects
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layout: ../../layouts/MainLayout.astro
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---
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import { MiniRepl } from '../../docs/MiniRepl';
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import { JsDoc } from '../../docs/JsDoc';
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# Audio Effects
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Whether you're using a synth or a sample, you can apply any of the following built-in audio effects.
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As you might suspect, the effects can be chained together, and they accept a pattern string as their argument.
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# Filters
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Filters are an essential building block of [subtractive synthesis](https://en.wikipedia.org/wiki/Subtractive_synthesis).
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Strudel comes with 3 types of filters:
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- low-pass filter: low frequencies may _pass_, high frequencies are cut off
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- high-pass filter: high frequencies may _pass_, low frequencies are cut off
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- band-pass filters: only a frequency band may _pass_, low and high frequencies around are cut off
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Each filter has 2 parameters:
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- cutoff: the frequency at which the filter starts to work. e.g. a low-pass filter with a cutoff of 1000Hz allows frequencies below 1000Hz to pass.
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- q-value: Controls the resonance of the filter. Higher values sound more aggressive. Also see [Q-Factor](https://en.wikipedia.org/wiki/Q_factor)
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## lpf
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<JsDoc client:idle name="lpf" h={0} />
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## lpq
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<JsDoc client:idle name="lpq" h={0} />
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## hpf
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<JsDoc client:idle name="hpf" h={0} />
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## hpq
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<JsDoc client:idle name="hpq" h={0} />
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## bpf
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<JsDoc client:idle name="bpf" h={0} />
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## bpq
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<JsDoc client:idle name="bpq" h={0} />
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## vowel
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<JsDoc client:idle name="vowel" h={0} />
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# Amplitude Envelope
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The amplitude [envelope](<https://en.wikipedia.org/wiki/Envelope_(music)>) controls the dynamic contour of a sound.
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Strudel uses ADSR envelopes, which are probably the most common way to describe an envelope:
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[image link](https://commons.wikimedia.org/wiki/File:ADSR_parameter.svg)
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## attack
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<JsDoc client:idle name="attack" h={0} />
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## decay
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<JsDoc client:idle name="decay" h={0} />
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## sustain
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<JsDoc client:idle name="sustain" h={0} />
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## release
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<JsDoc client:idle name="release" h={0} />
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# Dynamics
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## gain
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<JsDoc client:idle name="gain" h={0} />
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## velocity
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<JsDoc client:idle name="velocity" h={0} />
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# Panning
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## jux
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<JsDoc client:idle name="jux" h={0} />
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## juxBy
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<JsDoc client:idle name="juxBy" h={0} />
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## pan
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<JsDoc client:idle name="pan" h={0} />
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# Waveshaping
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## coarse
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<JsDoc client:idle name="coarse" h={0} />
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## crush
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<JsDoc client:idle name="crush" h={0} />
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## shape
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<JsDoc client:idle name="shape" h={0} />
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# Global Effects
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## Local vs Global Effects
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While the above listed "local" effects will always create a separate effects chain for each event,
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global effects use the same chain for all events of the same orbit:
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## orbit
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<JsDoc client:idle name="orbit" h={0} />
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## delay
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<JsDoc client:idle name="delay" h={0} />
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## delaytime
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<JsDoc client:idle name="delaytime" h={0} />
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## delayfeedback
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<JsDoc client:idle name="delayfeedback" h={0} />
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## room
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<JsDoc client:idle name="room" h={0} />
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## roomsize
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<JsDoc client:idle name="roomsize" h={0} />
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Next, we'll look at strudel's support for [Csound](/learn/csound).
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