SampleDur duration of one sample
superclass: InfoUGenBase
returns the current sample duration of the server in seconds
*ir
equivalent to 1 / SampleRate
related: minNyquist
// examples
{ SampleDur.ir.poll }.play;
{ (1/SampleDur.ir).poll }.play;
// drive a demand ugen at samplerate
{ Duty.ar(SampleDur.ir, 0, Dbrown(-1.0, 1.0, 0.01, inf)) * 0.1 }.play