bexprnd — Exponential distribution random number generator.
krange -- the range of the random numbers (-krange to +krange)
For more detailed explanation of these distributions, see:
C. Dodge - T.A. Jerse 1985. Computer music. Schirmer books. pp.265 - 286
D. Lorrain. A panoply of stochastic cannons. In C. Roads, ed. 1989. Music machine . Cambridge, Massachusetts: MIT press, pp. 351 - 379.
Here is an example of the bexprnd opcode. It uses the file bexprnd.csd.
Example 98. Example of the bexprnd opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;RT audio out ;-iadc ;;;uncomment -iadc if RT audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o bexprnd.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 ; every run time same values kexp bexprnd 100 printk .2, kexp ; look aout oscili 0.8, 440+kexp, 1 ; & listen outs aout, aout endin instr 2 ; every run time different values seed 0 kexp bexprnd 100 printk .2, kexp ; look aout oscili 0.8, 440+kexp, 1 ; & listen outs aout, aout endin </CsInstruments> <CsScore> ; sine wave f 1 0 16384 10 1 i 1 0 2 i 2 3 2 e </CsScore> </CsoundSynthesizer>
      Its output should include a line like:
      
 i   1 time     0.00267:    99.27598
 i   1 time     0.20267:    74.97176
 i   1 time     0.40267:   -35.67213
 i   1 time     0.60267:     1.10579
 i   1 time     0.80267:   -18.08816
 i   1 time     1.00000:    28.93329
 i   1 time     1.20267:   320.63733
 i   1 time     1.40267:  -332.05614
 i   1 time     1.60267:  -212.66361
 i   1 time     1.80000:   -92.57433
 i   1 time     2.00000:   140.70939
Seeding from current time 4055201702
 i   2 time     3.00267:   190.30495
 i   2 time     3.20267:   -58.30677
 i   2 time     3.40267:   192.39784
 i   2 time     3.60000:    12.72448
 i   2 time     3.80267:    79.91503
 i   2 time     4.00000:    34.44258
 i   2 time     4.20000:   167.92680
 i   2 time     4.40267:  -117.10278
 i   2 time     4.60267:   -70.99155
 i   2 time     4.80267:   -23.24037
 i   2 time     5.00000:  -226.35500