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Recent synth speed-up lost spectral purity in some cases.
This fixed version should be as fast as possible whilst remaining pure.
Also added a new pure exponential sweep, and a squared sweep.

--- a/src/test-srcs

+++ b/src/test-srcs

@@ -17,7 +17,7 @@

 test_converters () {

   # Create input file

-  $SOX -r $1 -n -twavpcm $IN synth 20 sin 0~`expr $1 / 2` gain -2 

+  $SOX -r $1 -n -twavpcm $IN synth 20 sin 0:`expr $1 / 2` gain -2 

   for src in \

       "polyphase" \

       "rabbit -c0" \