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gibberish-dsp

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Gibberish is designed to be an optimized API for audio synthesis using per-sample techniques.

www.charlie-roberts.com/gibberish

gibber-cc/gibberish

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/* tutorial 3: filtering * * There are currently five different filter models * in Gibberish. * * 1. Filter24Moog - 24db per octave "virtual analog" aka "zero-delay" ladder filter. lp. * 2. Filter24TB303 - 24db per octave "virtual analog" aka "zero-delay" diode filter. lp. * 3. Filter12SVF - (TEMPORARILY BROKEN). 12dB per octave state variable filter. lp, hp, bp, notch. * 4. Filter12Biquad - 12dB per octave biquad. lp, hp, bp. * 5. Filter24Classic - 24db per octave ladder filter (original Gibberish ladder filter). lp, hp. * * These filters can all be used independently or as a built-in part of the Synth, FM * and Monosynth instruments. */ osc = Saw() filter = Filter12Biquad({ input:osc }).connect() //cutoff on all filters is measured from 0-1. filter.cutoff = Add( .4, Sine({ frequency:.5, gain:.25 }) ) /* Q on all filters is measured from 0-1. * BEWARE! Using high Q values (above .6) can results in massive * feedback depending on the cutoff frequencies, filter model and * input signals in use. */ filter.Q = 0 // change from default behavior (lowpass) to high pass // 0 = lowpass, 1 = highpass, 2 = bandpass filter.mode = 1 /* some instruments have filters built-in to them. The Monosynth and Synth * have filters enabled by default; for the FM instrument you'll need to enable it by * setting the filterType variable to a non-zero value. These numbers correspond * to the list at the top of this tutorial, e.g. choose 3 to use the TB303 filter model. */ syn = Synth({ attack:44 }).connect() syn.note( 220 ) // default Filter24Moog model syn.filterModel = 2 // tb-303 filter model syn.saturation = 20 // distortion only available in tb-303 filter model syn.Q = .65 seq = Sequencer.make( [110,165,220], [11025], syn, 'note' ).start() /* in addition to a cutoff property to control the cutoff frequency * of the filter, synths also have a filterMult property that * determines how much the synths envelope modulates the filter * by. E.g. if a synth has a cutoff frequency of 110, and a * filterMult property of 1000, then the final filter cutoff will * travel between 110-1110 Hz over the envelope. */ syn.cutoff = .65 syn.filterMult *= 2