Have a go at being slightly more intelligent in the cello transposition.

makeCello.sh

@@ -22,6 +22,13 @@ mkdir -p $outdir
 find $booke -name "*.abc" | sort |
     while read filename
     do
+        # Move down either one octave or two, depending on the range
+        # of the tune. If there are any notes below middle C, transpose
+        # down one octave. The default is to transpose down two octaves.
+        middle="d"
+        if grep -v "^[A-Z]:" $filename | sed -e 's/"[^"]*"//g' | grep -q "[A-Z],"; then
+            middle="D"
+        fi
         name=`basename $filename .abc`
-        sed -e "/^ *K:/s/$/ octave=-2/" $filename > $outdir/$name.abc
+        sed -e "/^ *K:/s/$/ middle=$middle/" $filename > $outdir/$name.abc
     done