Hey. I'm trying to write some C code that uses the phase vocoder in csound. I need to determine the length of any audio file the code runs in seconds, so I'm trying to use ftlen in Csound to accomplish this instead of writing a function in C. However, I can't figure out how to get the output of ftlen and use it in the pvoc opcode. I essentially want Csound to take the ift output, divide that by the sample rate to produce the length in seconds, and use that value for ktime in pvoc.

Great! That's exactly what I was trying to do. Thanks!