now with a working OSC responder to the done message

fdfNMF.sc

@@ -1,7 +1,19 @@
 // adds an instance method to the Buffer class
 + Buffer {
-	fdNMF { arg dstBuf, rank = 1, iterations = 100, fftSize = 2048, windowSize = 2048, hopSize = 512;
+	fdNMF { arg dstBuf, rank = 1, iterations = 100, fftSize = 2048, windowSize = 2048, hopSize = 512, action;
+		var resp;
+
 		if(bufnum.isNil) { Error("Cannot call % on a % that has been freed".format(thisMethod.name, this.class.name)).throw };
+
+		// responder idea stolen from getToFloatArray
+		resp = OSCFunc({ arg msg;
+			if(msg[1]== '/b_gen' && msg[2]== dstBuf.bufnum, {
+				// ("received" + msg).postln;
+				resp.clear;
+				action.value(dstBuf.bufnum);
+			});
+		}, '/done', server.addr);
+
 		server.listSendMsg([\b_gen, dstBuf.bufnum, "BufNMF", bufnum, rank, iterations, fftSize, windowSize, hopSize])
 	}
 }

tests.scd

@@ -5,6 +5,7 @@ b = Buffer.read(s,"/Applications/Max.app/Contents/Resources/C74/media/msp/jongly
 b.play;
 b.plot;
 c = Buffer.alloc(s,b.numFrames,2);
+e = Buffer.alloc(s,b.numFrames,5);
 
 // run the code
 b.fdNMF(c,2)
@@ -13,13 +14,8 @@ b.fdNMF(c,2)
 c.plot;
 {PlayBuf.ar(2,c.bufnum,doneAction:2)}.play
 
-
-// play a sinewave in the background to see if the server freaks out
-d = {SinOsc.ar(100,0,0.1)}.play
-e = Buffer.alloc(s,b.numFrames,5);
-
 // run the code
-b.fdNMF(e,5, 150, 2048,1024,256)
+b.fdNMF(e,5, 150, 2048,1024,256,{|x| "itworks".postln; x.postln;})
 
 // read to check
 e.plot;