PV_LocalMax pass bins which are a local maximum

PV_LocalMax.ar(buffer,  threshold)

Passes only bins whose magnitude is above a threshold and above their nearest neighbors.

buffer - fft buffer.

threshold - magnitude threshold.

s.boot;

(

b = Buffer.alloc(s,2048,1);

c = Buffer.read(s,"sounds/a11wlk01.wav");

)

(

SynthDef("help-localMax", { arg out=0, bufnum=0;

var in, chain;

in = Mix.arFill(3, { LFSaw.ar(exprand(100, 500), 0, 0.1); });

chain = FFT(bufnum, in);

chain = PV_LocalMax(chain, MouseX.kr(0, 50)); 

Out.ar(out, 0.5 * IFFT(chain).dup);

}).play(s,[\out, 0, \bufnum, b.bufnum]);

)

(

SynthDef("help-localMax2", { arg out=0, bufnum=0, soundBufnum=2;

var in, chain;

in = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 1);

chain = FFT(bufnum, in);

chain = PV_LocalMax(chain, MouseX.kr(0, 100)); 

Out.ar(out, 0.5 * IFFT(chain).dup);

}).play(s,[\out, 0, \bufnum, b.bufnum, \soundBufnum, c.bufnum]);

)