diff --git a/synth.sh b/synth.sh
index 8ea198b..ac73663 100755
--- a/synth.sh
+++ b/synth.sh
@@ -5,25 +5,31 @@
 
 PATH=$PATH:~/codec2/build_linux/src:~/codec2/build_linux/misc
 
-if [ "$#" -ne 4 ]; then
-    echo "usage: ./synth.sh rawFile nn.h5 startSecs lengthSecs"
+if [ "$#" -lt 2 ]; then
+    echo "usage: ./synth.sh rawFile nn.h5 [startSecs lengthSecs]"
 fi
+
 speech=$1
 nn=$2
-st=$3
-len=$4
 x=$(basename $speech)
 base="${x%.*}"
 out_model=out.model
 seg=$(mktemp)'.sw'
 echo $seg
+if [ "$#" -lt 4 ]; then
+    sox -t .sw -r 8000 -c 1 $speech -t .sw $seg
+else
+    st=$3
+    len=$4
+    sox -t .sw -r 8000 -c 1 $speech -t .sw - trim $st $len > $seg
+fi    
 
-sox -t .sw -r 8000 -c 1 $speech -t .sw - trim $st $len > $seg
 c2sim $seg --modelout - | est_n0 -r > $base'_nolinear.model'
 ./phasenn_out.py $base'_nolinear.model' $nn $base'_out.model'
 c2sim $seg --modelout - | est_n0 -a $base'_out.model' > $base'_comb.model'
-c2sim $seg --modelin $base'_comb.model' -o $base'_outnn.sw'
+c2sim $seg --modelin $base'_comb.model' --postfilter -o $base'_outnn.sw'
 
-# orig speech - sinusoidal orig phases - sinusoidal phaseNN
+# orig speech - sinusoidal orig phases - sinusoidal phase0 - sinusoidal phaseNN
 c2sim $seg -o $base'_out.sw'
-sox $seg $base'_out.sw' $base'_outnn.sw' $base'_all.sw'
+c2sim $seg --phase0 --postfilter -o $base'_outp0.sw'
+sox $seg $base'_out.sw' $base'_outp0.sw' $base'_outnn.sw' $base'_all.sw'