schedwhen — Adds a new score event.


Adds a new score event.


schedwhen ktrigger, kinsnum, kwhen, kdur [, ip4] [, ip5] [...]
schedwhen ktrigger, "insname", kwhen, kdur [, ip4] [, ip5] [...]


ip4, ip5, ... -- Equivalent to p4, p5, etc., in a score i statement.


kinsnum -- instrument number. Equivalent to p1 in a score i statement.

insname -- A string (in double-quotes) representing a named instrument.

ktrigger -- trigger value for new event

kwhen -- start time of the new event. Equivalent to p2 in a score i statement.

kdur -- duration of event. Equivalent to p3 in a score i statement.

schedwhen adds a new score event. The event is only scheduled when the k-rate value ktrigger is first non-zero. The arguments, including options, are the same as in a score. The iwhen time (p2) is measured from the time of this event.

If the duration is zero or negative the new event is of MIDI type, and inherits the release sub-event from the scheduling instruction.

[Warning] Warning

Support for named instruments is broken in version 4.23


Here is an example of the schedwhen opcode. It uses the file schedwhen.csd.

Example 418. Example of the schedwhen opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

; Select audio/midi flags here according to platform
; Audio out   Audio in
-odac           -iadc    ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o schedwhen.wav -W ;;; for file output any platform

; Initialize the global variables.
sr = 44100
kr = 44100
ksmps = 1
nchnls = 1

; Instrument #1 - oscillator with a high note.
instr 1
  ; Use the fourth p-field as the trigger.
  ktrigger = p4
  kinsnum = 2
  kwhen = 0
  kdur = p3

  ; Play Instrument #2 at the same time, if the trigger is set.
  schedwhen ktrigger, kinsnum, kwhen, kdur

  ; Play a high note.
  a1 oscils 10000, 880, 1
  out a1

; Instrument #2 - oscillator with a low note.
instr 2
  ; Play a low note.
  a1 oscils 10000, 220, 1
  out a1


; Table #1, a sine wave.
f 1 0 16384 10 1

; p4 = trigger for Instrument #2 (when p4 > 0).
; Play Instrument #1 for half a second, trigger Instrument #2.
i 1 0 0.5 1
; Play Instrument #1 for half a second, no trigger.
i 1 1 0.5 0


See Also



Author: John ffitch
University of Bath/Codemist Ltd.
Bath, UK
November 1998

Example written by Kevin Conder.

New in Csound version 3.491

Based on work by Gabriel Maldonado