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Use a-rate value in if-statement condition?

#1

Currently writing a UDO for freezing audio for a set period of time. Figured I could check when the a-rate phasor value reaches 1 to exit an if-statement and avoid rewriting the audio buffer, but it seems like it’s not possible to use a-rate variables in if-statements?

I’m getting this error:

error: boolean expression '>=' with arg types ac not found, line 36

Any suggestions on how I could do this otherwise? I tried a k-rate phasor for the if-statement, but it doesn’t update often enough to hit 1 it seems.

#2

You can access the vector that contains the a- values of a signal (all ksmps values which are calculated during the k-pass) with vaget opcode. Here is the manual page.
With a while ... do block, you can read each one of them and make decisions according to their value.

#3

Thanks for the suggestion. Figured out in my case the easiest solution was to replace phasor with linseg and convert that to k-rate with k(aVar).

#4

A typical solution to this kind of problem is to create a UDO with ksmps set to 1, then your k-rate signals are basically a-rate, and you can do your comparisons, for example…(pseudo code, untested…)

opcode k, k
aInput xin
kInput downsamp aInput
if kInput == 1 then
....