diff --git a/VERSION b/VERSION
index e28a4be..4b29c29 100644
--- a/VERSION
+++ b/VERSION
@@ -1,2 +1,2 @@
-December 27 2022
+December 30 2022
 
diff --git a/doc/CHANGES b/doc/CHANGES
index 020e691..408ee96 100644
--- a/doc/CHANGES
+++ b/doc/CHANGES
@@ -14951,6 +14951,28 @@ an extra parameter, word, indicating the type of directive.
 It will issue a warning if it detects a '/' in the sound= or
 shift= directives.
 
-
+December 30 2022
+
+abcmidi: The instrument=*/c is a special directive that suppresses
+a transpose.  For example:
+
+X:2
+T: transpose using instrument=_B/c
+T: clarinet coded in concert pitch, displayed in Bb (as in player part)
+M: 4/4
+L: 1/4
+K: C 
+V:1 nm="Flute"
+CDEF|GABc|cBAG|FEDC|
+V:2 instrument=_B/c  nm="Clarinet\nin Bb"
+CDEF|GABc|cBAG|FEDC|
+
+The notes in V:2 are displayed up using score=_Bc, but they are still
+played as written (sound=cc does nothing).
+Fix: the code in the block 
+if (casecmp(word,"instrument") == 0 {
+...
+}
+in parsesound() (parseabc.c) was rewritten.
 
 
diff --git a/doc/readme.txt b/doc/readme.txt
index 44cfac4..78c7916 100644
--- a/doc/readme.txt
+++ b/doc/readme.txt
@@ -1,7 +1,7 @@
 abcMIDI :   abc <-> MIDI conversion utilities
 
 midi2abc version 3.58 December 09 2022
-abc2midi version 4.78 December 27 2022
+abc2midi version 4.80 December 30 2022
 abc2abc  version 2.18 June 14 2022
 yaps     version 1.90 June 14 2022
 abcmatch version 1.82 June 14 2022
diff --git a/parseabc.c b/parseabc.c
index be6995b..58c4558 100644
--- a/parseabc.c
+++ b/parseabc.c
@@ -1022,8 +1022,7 @@ parsetranspose (s, word, gottranspose, transpose)
 };
 
 /* [SS] 2021-10-11 */
-int
-parsesound (s, word, gottranspose, transpose)
+int parsesound (s, word, gottranspose, transpose)
 /* parses string sound = 
                  shift =
                  instrument = note1note2 or note1/note2
@@ -1054,15 +1053,25 @@ parsesound (s, word, gottranspose, transpose)
       p2 = note2midi (s,word);
       /*printf("p2 midi note = %d\n",p2);*/ 
 
-      if (p2 == p1) {
-          p2 = 72;  /* [SS] 2022.12.21 */
+      if (p2 == p1 || p2 == 0) {
+          *transpose = 72 - p1;  /* [SS] 2022.12.30 */
           } 
       if (casecmp(word,"instrument") == 0) { /*2022.12.27 */
           *transpose = p1 - p2; /* [SS] 2022.02.18 2022.04.27 */
+	  if (p2 == 0) { /* <note2> is missing */
+            *transpose = p1 - 72;
+	     }
+          if (p2 == p1 || p2 == 0) {
+            *transpose = p1 - 72;  /* [SS] 2022.12.30 */
+          } 
+	   if (p2 == 72 && fileprogram == ABC2MIDI) {
+            *transpose = 0;
+	     }  /* [SS] 2022.12.30 */
        } else {
           *transpose = p2 - p1; /* [SS] 2022.02.18 2022.04.27 */
        }
        *gottranspose = 1;
+       /*printf("p1 = %d p2 = %d transpose = %d\n",p1,p2,*transpose);*/
      }
   return 1;
   }
@@ -2752,8 +2761,7 @@ return p;
 
 
 /* [SS] 2021-10-11   */
-int
-note2midi (char** s, char *word)
+int note2midi (char** s, char *word)
 {
 /* for implementing sound=, shift= and instrument= key signature options */
 
@@ -2865,7 +2873,7 @@ switch (**s)
   } 
   if (note == ' ')
     {
-      event_error ("Malformed note : expecting a-g or A-G");
+      return 0;
     }
   pitch = pitch2midi(note, accidental, mult, octave);
   return pitch;
diff --git a/store.c b/store.c
index a101d50..ef3aab3 100644
--- a/store.c
+++ b/store.c
@@ -186,7 +186,7 @@ int main()
 
 */
 
-#define VERSION "4.78 December 27 2022 abc2midi" 
+#define VERSION "4.80 December 30 2022 abc2midi" 
 
 /* enables reading V: indication in header */
 #define XTEN1 1