PermModT
Extension
ExtensionDescription
This UGen takes an audio-rate input and commutes chunks of samples, swapping the odd chunks and the even ones inside a buffer. The size of the buffer depends on the "outfreq" parameter, the size of the chunks on the "infreq" one.
The difference with the PermMod UGen is that it generates a "tail" as the remainder of the ratio of "outfreq" and "infreq", since in most cases the permutation won't be able to do an integer number of odd-even cycles inside the buffer, leaving some samples.
When the buffer is reaching the end, it behaves in two ways: if the buffer contains an integer number of odd-even couples, it copies the remaining samples to fill the buffer (the tail) directly from the input; if there is a last spare odd chunk, it commutes it with the tail.
To avoid bad behaviour, "infreq" and "outfreq" parameters must always be strictly > 0 and <= double the input samplerate. High frequencies lead to distortion and resonance, low frequencies lead to auto-arpeggio-like and repetition-like effects. Also, "outfreq" should be equal or less than infreq.
Class Methods
.ar
Arguments:
| in |
An audio-rate input. |
| outfreq |
The frequency at which the buffer cycles (and the tail occurs). |
| infreq |
The frequency at which chunks are permuted inside the buffer. |
| mul |
Output will be multiplied by this value. |
| add |
This value will be added to the output. |
Returns:
A commuted audio-rate output.
Examples
// Permute a simple sinusoid: {PermModT.ar(SinOsc.ar(220),280,1600)}.play // Modulate both outfreq and infreq parameters with the mouse: {PermModT.ar(SinOsc.ar(220), MouseX.kr(500, 1200), MouseY.kr(1200,4000))}.play //Remember to avoid the outfreq>infreq case! // Distort any input with an Electronic Telephone Ring effect: {PermModT.ar(SoundIn.ar(0),500,Pulse.kr(10,0.5,1000,2000))}.play // Remember to use strictly positive unipolar signals as control, in this case the Pulse "add" parameter is 1000. // Quantized frequency-sweep-like effect on existing file: b = Buffer.read(s, 'C:/Folder/File.wav') {PermModT.ar(PlayBuf.ar(2, b),SinOsc.kr(0.1,0,2000,4000),4200)}.play
link::sc3-plugins/Classes/PermModT::