vaget
vaget — Access values of the current buffer of an a-rate variable by indexing.
Description
Access values of the current buffer of an a-rate variable by indexing. Useful for doing sample-by-sample manipulation at k-rate without using setksmps 1.
![[Note]](images/note.png)
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Because this opcode does not do any bounds checking, the user must be careful not to try to read values past ksmps (the size of a buffer for an a-rate variable) by using index values greater than ksmps. |
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In Csound6 this opcode does do bounds checking. |
Performance
kval - value read from avar
kndx - index of the sample to read from the current buffer of the given avar variable
avar - a-rate variable to read from
Examples
Here is an example of the vaget opcode. It uses the file vaget.csd.
Example 968. Example of the vaget 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 avarget.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr=44100 ksmps=16 nchnls=2 instr 1 ; Sqrt Signal ifreq = (p4 > 15 ? p4 : cpspch(p4)) iamp = ampdb(p5) aout init 0 ksampnum init 0 kenv linseg 0, p3 * .5, 1, p3 * .5, 0 aout1 vco2 1, ifreq aout2 vco2 .5, ifreq * 2 aout3 vco2 .2, ifreq * 4 aout sum aout1, aout2, aout3 ;Take Sqrt of signal, checking for negatives kcount = 0 loopStart: kval vaget kcount,aout if (kval > .0) then kval = sqrt(kval) elseif (kval < 0) then kval = sqrt(-kval) * -1 else kval = 0 endif vaset kval, kcount,aout loop_lt kcount, 1, ksmps, loopStart aout = aout * kenv aout moogladder aout, 8000, .1 aout = aout * iamp outs aout, aout endin </CsInstruments> <CsScore> i1 0.0 2 440 80 e </CsScore> </CsoundSynthesizer>