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an open-source digital signal processing and sound synthesis language
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STGRANR -- sampling stochastic granular processor
quick syntax:STGRANR(outsk, insk, dur, amp, rate, p5-8: ratevar, p9-12: duration, p13-16: location, p17-20: transposition[, grainlayers (not used), seed])
p0 = output start time (seconds) p1 = input start time (seconds) p2 = duration (seconds) p3 = amplitude multiplier (relative multiplier of input signal) p4 = grain rate (seconds) p5-8 = rate variance (between 0.0 and 1.0; it is the % variation in rate - 100% being the rate) p9-12 = duration values (seconds) p13-16 = location values (0-1 stereo; 0.5 is middle) p17-20 = transposition values p21 = grainlayers [optional; default is 0] p22 = random number seed [optional; default is 0] Because this instrument has not been updated for pfield control, the older makegen control envelope sysystem should be used: assumes function table 1 is the amplitude envelope function table 2 is the synthesis waveform, function table 3 is grain amplitude envelope Parameters after the [bracket] are optional and default to 0 unless otherwise noted. Author: Mara Helmuth (mara dot helmuth at uc dot edu)
STGRANR does stochastic granular signal-processing, decomposing an input soundfile or real-time sound source. It's a fairly powerful instrument, with lots of snazzy gen-envelope controls to produce evolving granular textures. To best understand the concepts behind the design of this instrument, see Mara Helmth's papers on the use of these techniques.
It was originally adapted from the older stgran Cmix instrument, also written by Mara.
Usage NotesAt present the setting of the buffer size in rtsetparams appears to have a significant effect on the output of this instrument.
STGRANR will take mono or stereo input files, it requires stereo output.
Sample Scoresvery basic:
set_option("FULL_DUPLEX_ON") rtsetparams(44100, 2) load("STGRANR") rtinput("AUDIO","MIC",2) makegen(1, 7, 1000, 1, 950, 1, 50, 0) makegen(2, 25, 1000, 1) start = 0.0 /* p0start, p1inputstt, p2dur, p3amp */ STGRANR(start, 0, 13, 5000, /* grain rate, ratevar values (must be positive, % until next grain possible displacement): */ .1, 0.0, 0.1, 0.2, 1.0, /* duration values: */ .1,.1,.1,2, /* location values: */ 0.0,0.5,1.0,10.0, /* pitch values: */ 0.0,0.00,0.07,2, /* granlyrs, seed */ 1,1)
See AlsoGRANSYNTH, GRANULATE, JCHOR, JGRAN, SGRANR