Stochastic granular synthesis.
in RTcmix/insts/std/MARAGRAN
SGRANR(outsk, dur, amp, rate, p4-7: ratevar, p8-11: duration, p12-15: location, p16-19: transposition[, grainlayers (not used), seed])
| Param Field | Parameter | Units | Dynamic | Optional | Notes |
|---|---|---|---|---|---|
| p0 | output start time | seconds | no | no | |
| p1 | duration | seconds | no | no | |
| p2 | amplitude multiplier | relative multiplier of input signal | no | no | |
| p3 | grain rate | seconds | no | no | |
| p4-7 | rate variance | between 0.0 and 1.0 | no | no | the % variation in rate - 100% being the rate |
| p8-11 | duration values | seconds | no | no | |
| p12-15 | location values | 0-1 stereo; 0.5 is middle | no | no | |
| p16-19 | pitch values | Hz | no | no | |
| p20 | grainlayers | - | no | yes | default: 0 |
| p21 | random number seed | - | no | yes | default: 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)
SGRANR does stochastic granular synthesis. 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 sgran Cmix instrument, also written by Mara.
At present the setting of the buffer size in rtsetparams appears to have a significant effect on the output of this instrument.
SGRANR produces stereo output.
very basic:
rtsetparams(44100, 2)
load("SGRANR")
makegen(1, 7, 1000, 1, 950, 1, 50, 0)
makegen(2, 10, 1000, 1)
makegen(3, 7, 1000, 0, 500, 1, 500, 0)
start = 0.0
SGRANR(start, 9.7, 20000,
/* grain rate, ratevar values (must be positive,
% until next grain possible displacement): */
.1, 0.1, 0.1, 0.1, 1.0,
/* duration values: */
.1,.1,.1,2,
/* location values: */
0.0,.5,1.0,1.0,
/* pitch values: */
800,1000,9700,2,
/* granlyrs, seed */
1,1)