diff --git a/makeWebAudio.sh b/makeWebAudio.sh
index b7785da..3d8a736 100755
--- a/makeWebAudio.sh
+++ b/makeWebAudio.sh
@@ -60,14 +60,20 @@ makeaudiofortempo()
         echo "Warning: $1 has no tempo. Using 120."
         tempo="120"
     fi
-    pos=`expr index $tempo '='`
-    numtempo=${tempo:pos}
-    notelenprefix=${tempo:0:pos}
+    numtempo=${tempo##*=}
+    notelenprefix=${tempo%%=*}
+    if [ "$notelenprefix" = "$numtempo" ]; then
+        notelenprefix=
+    else
+        notelenprefix="${notelenprefix}="
+    fi
     # Calculate new tempo.
     newtempo=$(( ( $numtempo * $4 ) / $5 ))
+    echo "Old tempo $tempo new tempo ${notelenprefix}${newtempo}"
     # Insert new tempo and delete old. Old may not exist,
     # so do this rather than overwrite.
-    sed -e "/^Q:/d" -e "/^K:/aQ: ${notelenprefix}${newtempo}" $1 > $tunedir/$newspeedfilename
+    sed -e "/^Q:/d" -e "/^K:/a\\
+Q: ${notelenprefix}${newtempo}" $1 > $tunedir/$newspeedfilename
     makeaudiofiles $tunedir/$newspeedfilename $tunedir --mute=0,-1
     rm $tunedir/$newspeedfilename
 }