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diff --git a/externals/grill/fftease/src/swinger~.cpp b/externals/grill/fftease/src/swinger~.cpp
new file mode 100644
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+++ b/externals/grill/fftease/src/swinger~.cpp
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+/*
+
+FFTease - A set of Live Spectral Processors
+Originally written by Eric Lyon and Christopher Penrose for the Max/MSP platform
+
+Copyright (c)Thomas Grill (xovo@gmx.net)
+For information on usage and redistribution, and for a DISCLAIMER OF ALL
+WARRANTIES, see the file, "license.txt," in this distribution.  
+
+*/
+
+#include "main.h"
+#include <stdlib.h>
+
+
+// add quality switch
+
+class swinger:
+	public fftease
+{
+	FLEXT_HEADER(swinger,fftease)
+	
+public:
+	swinger();
+
+protected:
+
+	virtual V Transform(I n,S *const *in);
+};
+
+FLEXT_LIB_DSP("fftease, swinger~",swinger)
+
+
+swinger::swinger():
+	fftease(2,F_STEREO|F_BITSHUFFLE)
+{
+	AddInSignal("Messages and input signal");
+	AddInSignal("Signal to supply phase information");
+	AddOutSignal("Transformed signal");
+}
+
+
+V swinger::Transform(I _N2,S *const *in)
+{
+	for (I i = 0; i <= _N2; i++ ) {
+		const I even = i*2,odd = even+1;
+
+		// convert to polar coordinates from complex values 
+		// replace signal one's phases with those of signal two 
+		const F a1 = ( i == _N2 ? _buffer1[1] : _buffer1[even] );
+		const F b1 = ( i == 0 || i == _N2 ? 0. : _buffer1[odd] );
+		const F amp = hypot( a1, b1 );
+
+		const F a2 = ( i == _N2 ? _buffer2[1] : _buffer2[even] );
+		const F b2 = ( i == 0 || i == _N2 ? 0. : _buffer2[odd] );
+		const F ph = -atan2( b2, a2 );
+
+		_buffer1[even] = amp * cos( ph );
+		if ( i != _N2 )
+			_buffer1[odd] = -amp * sin( ph );
+	}
+}