ares expseg ia, idur1, ib [, idur2] [, ic] [...]
kres expseg ia, idur1, ib [, idur2] [, ic] [...]
ia -- starting value. Zero is illegal for exponentials.
ib, ic, etc. -- value after dur1 seconds, etc. For exponentials, must be non-zero and must agree in sign with ia.
idur1 -- duration in seconds of first segment. A zero or negative value will cause all initialization to be skipped.
idur2, idur3, etc. -- duration in seconds of subsequent segments. A zero or negative value will terminate the initialization process with the preceding point, permitting the last-defined line or curve to be continued indefinitely in performance. The default is zero.
These units generate control or audio signals whose values can pass through 2 or more specified points. The sum of dur values may or may not equal the instrument's performance time: a shorter performance will truncate the specified pattern, while a longer one will cause the last-defined segment to continue on in the same direction.
Note that the expseg opcode does not operate correctly at audio rate when segments are shorter than a k-period. Try the expsega opcode instead.
Here is an example of the expseg opcode. It uses the files expseg.orc and expseg.sco.
Example 121. Example of the expseg opcode.
/* expseg.orc */ ; Initialize the global variables. sr = 44100 kr = 4410 ksmps = 10 nchnls = 1 ; Instrument #1. instr 1 ; p4 = frequency in pitch-class notation. kcps = cpspch(p4) ; Create an amplitude envelope. kenv expseg 0.01, p3*0.25, 1, p3*0.75, 0.01 kamp = kenv * 30000 a1 oscil kamp, kcps, 1 out a1 endin /* expseg.orc */
/* expseg.sco */ ; Table #1, a sine wave. f 1 0 16384 10 1 ; Play Instrument #1 for a half-second, p4=8.00 i 1 0 0.5 8.00 ; Play Instrument #1 for a half-second, p4=8.01 i 1 1 0.5 8.01 ; Play Instrument #1 for a half-second, p4=8.02 i 1 2 0.5 8.02 ; Play Instrument #1 for a half-second, p4=8.03 i 1 3 0.5 8.03 e /* expseg.sco */