Try Cello transposition algorithm again.

makeCello.sh

@@ -17,22 +17,24 @@ fi
 # octave. $2 is highest note, $3 is lowest note.
 #
 # If range is G to d', transpose down 2 octaves.
-# If lowest note is < C, transpose down 1 octave.
 # Otherwise calculate the distance above d for the highest note on a one
-# octave transposition, and the distance below G on a two octave
+# octave transposition, and the distance below C on a two octave
 # transposition. Find the smallest, and use the corresponding
-# transposition.
+# transposition, preferring 2 octaves in case of a tie.
 transposedowntwo()
 {
     if (($3 >= 104 && $2 <= 115)); then
         return 0;
     fi
-    if (($3 < 100)); then
-        return 1;
-    fi
     over=$(($2 - 108))
-    under=$((104 - $3))
-    if (($over <= $under)); then
+    if (($over < 0)); then
+        over=0
+    fi
+    under=$((100 - $3))
+    if (($under < 0)); then
+        under=0
+    fi
+    if (($over < $under)); then
         return 1;
     fi