delayw — Writes the audio signal to a digital delay line.
delayw writes asig into the delay area established by the preceding delayr unit. Viewed as a pair, these two units permit the formation of modified feedback loops, etc. However, there is a lower bound on the value of idlt, which must be at least 1 control period (or 1/kr).
Here is an example of the delayw opcode. It uses the file delayw.csd.
Example 99. Example of the delayw 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
; Audio out Audio in No messages
-odac -iadc -d ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o delayw.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 2
; Instrument #1 -- Delayed beeps.
instr 1
; Make a basic sound.
abeep vco 20000, 440, 1
; Set up a delay line.
idlt = 0.1
adel delayr idlt
; Write the beep to the delay line.
delayw abeep
; Send the beep to the left speaker and
; the delayed beep to the right speaker.
outs abeep, adel
endin
</CsInstruments>
<CsScore>
; Table #1, a sine wave.
f 1 0 16384 10 1
; Keep the score running for 2 seconds.
f 0 2
; Play Instrument #1.
i 1 0.0 0.2
i 1 0.5 0.2
e
</CsScore>
</CsoundSynthesizer>