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.
Here is an example of the linseg opcode. It uses the files linseg.orc and linseg.sco.
Example 15-1. Example of the linseg opcode.
/* linseg.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 linseg 0, p3*0.25, 1, p3*0.75, 0
kamp = kenv * 30000
a1 oscil kamp, kcps, 1
out a1
endin
/* linseg.orc */
/* linseg.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
/* linseg.sco */