BufDur current duration of soundfile in buffer

superclass: BufInfoUGenBase

returns the current duration of soundfile

*kr(bufnum)

*ir(bufnum)

the .ir method is not the safest choice. Since a buffer can be reallocated at any time,

using .ir will not track the changes.

// example

s.sendMsg("/b_allocRead", 0, "sounds/a11wlk01.wav");

{ BufRd.ar(1, 0,  Sweep.ar(Impulse.ar(BufDur.kr(0).reciprocal), BufSampleRate.kr(0))) }.play;