diff --git a/release-packaging/Classes/FDCompose.sc b/release-packaging/Classes/FDCompose.sc
index 3f3acd2..357d7fa 100644
--- a/release-packaging/Classes/FDCompose.sc
+++ b/release-packaging/Classes/FDCompose.sc
@@ -1,11 +1,14 @@
 FDCompose{
-		*process { arg server, src, offsetframes1 = 0, numframes1 = -1, offsetchans1 = 0, numchans1 = -1, src1gain = 1, src1dstoffset = 0, src1dstchanoffset = 0, src2, offsetframes2 = 0, numframes2 = -1, offsetchans2 = 0, numchans2 = -1, src2gain = 1, src2dstoffset = 0, src2dstchanoffset = 0, dstbuf;
+		*process { arg server, srcBufNumA, startAtA = 0, nFramesA = -1, startChanA = 0, nChansA = -1, srcGainA = 1, dstStartAtA = 0, dstStartChanA = 0, srcBufNumB, startAtB = 0, nFramesB = -1, startChanB = 0, nChansB = -1, srcGainB = 1, dstStartAtB = 0, dstStartChanB = 0, dstBufNum;
+
+		if(srcBufNumA.isNil) {Error("Invalid Buffer").format(thisMethod.name, this.class.name).throw};
+		if(srcBufNumB.isNil) {Error("Invalid Buffer").format(thisMethod.name, this.class.name).throw};
+		if(dstBufNum.isNil) {Error("Invalid Buffer").format(thisMethod.name, this.class.name).throw};
 
 		server = server ? Server.default;
-		if(src.bufNum.isNil) {Error("Invalid Buffer").format(thisMethod.name, this.class.name).throw};
 
-		server.sendMsg(\cmd, \BufCompose, src.buNum, offsetframes1, numframes1, offsetchans1, numchans1, src1gain, src1dstoffset, src1dstchanoffset,
-			if( src2.isNil, -1, {src2.bufNum}), offsetframes2, numframes2, offsetchans2, numchans2, src2gain, src2dstoffset, src2dstchanoffset,
-			if( dstbuf.isNil, -1, {dstbuf.bufNum}));
+		server.sendMsg(\cmd, \BufCompose, srcBufNumA, startAtA, nFramesA, startChanA, nChansA, srcGainA, dstStartAtA, dstStartChanA,
+			srcBufNumB, startAtB, nFramesB, startChanB, nChansB, srcGainB, dstStartAtB, dstStartChanB,
+			dstBufNum);
 	}
-}
+}
\ No newline at end of file
diff --git a/src/fdCompose/tests.scd b/src/fdCompose/tests.scd
new file mode 100644
index 0000000..4b5d627
--- /dev/null
+++ b/src/fdCompose/tests.scd
@@ -0,0 +1,23 @@
+s.reboot
+////////////////////////////
+// test for efficiency
+
+(
+b = Buffer.read(s,"/Users/pa/Documents/documents@hudd/research/projects/fluid corpus navigation/research/archives-2017-18/denoise_stn/sources/01-mix.wav");
+c = Buffer.read(s,"/Users/pa/Documents/documents@hudd/research/projects/fluid corpus navigation/research/archives-2017-18/denoise_stn/sources/02-guit.wav");
+d = Buffer.new(s);
+)
+
+(
+// without basic params
+Routine{
+	t = Main.elapsedTime;
+	FDCompose.process(s, srcBufNumA: b.bufnum, srcBufNumB: c.bufnum, dstBufNum: d.bufnum);
+	s.sync;
+	(Main.elapsedTime - t).postln;
+}.play
+);
+
+d.query;
+d.play;
+d.plot
\ No newline at end of file