zkcl — Clears one or more variables in the zk space.
kfirst -- first zk location in the range to clear.
klast -- last zk location in the range to clear.
zkcl clears one or more variables in the zk space. This is useful for those variables which are used as accumulators for mixing k-rate signals at each cycle, but which must be cleared before the next set of calculations.
Here is an example of the zkcl opcode. Play zkcl.csd
Example 1254. Example of the zkcl 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 zkcl.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Initialize the global variables. sr = 44100 kr = 4410 ksmps = 10 nchnls = 1 ; Initialize the ZAK space. ; Create 1 a-rate variable and 1 k-rate variable. zakinit 1, 1 ; Instrument #1 -- a simple waveform. instr 1 ; Linearly vary a k-rate signal from 220 to 1760. kline line 220, p3, 1760 ; Add the linear signal to zk variable #1. zkw kline, 1 endin ; Instrument #2 -- generates audio output. instr 2 ; Read zk variable #1. kfreq zkr 1 ; Use the value of zk variable #1 to vary ; the frequency of a sine waveform. a1 oscil 20000, kfreq, 1 ; Generate the audio output. out a1 ; Clear the zk variables, get them ready for ; another pass. zkcl 0, 1 endin </CsInstruments> <CsScore> ; Table #1, a sine wave. f 1 0 16384 10 1 ; Play Instrument #1 for three seconds. i 1 0 3 ; Play Instrument #2 for three seconds. i 2 0 3 e </CsScore> </CsoundSynthesizer>