--- a/minijss/jssmod.c	Fri Mar 06 09:52:20 2015 +0200
+++ b/minijss/jssmod.c	Fri Mar 06 09:53:39 2015 +0200
@@ -374,7 +374,7 @@
 JSSPattern *jssAllocatePattern(const int nrows, const int nchannels)
 {
     int row, chn;
-    JSSPattern *res;
+    JSSPattern *pattern;
     JSSNote *pnote;
 
     // Check arguments
@@ -382,24 +382,23 @@
         JSSERROR(DMERR_INVALID_ARGS, NULL, "Invalid nrows=%i or nchannels=%i.\n", nrows, nchannels);
 
     // Allocate a pattern structure
-    res = dmMalloc0(sizeof(JSSPattern));
-    if (res == NULL)
+    if ((pattern = dmMalloc0(sizeof(JSSPattern))) == NULL)
         JSSERROR(DMERR_MALLOC, NULL, "Could not allocate pattern structure.\n");
 
     // Allocate notedata
-    res->data = dmCalloc(nrows * nchannels, sizeof(JSSNote));
-    if (res->data == NULL)
+    pattern->data = dmCalloc(nrows * nchannels, sizeof(JSSNote));
+    if (pattern->data == NULL)
     {
-        dmFree(res);
+        dmFree(pattern);
         JSSERROR(DMERR_MALLOC, NULL, "Could not allocate pattern data (nrows=%i, nchannels=%i).\n", nrows,
              nchannels);
     }
 
     // Initialize
-    res->nrows = nrows;
-    res->nchannels = nchannels;
+    pattern->nrows = nrows;
+    pattern->nchannels = nchannels;
 
-    pnote = res->data;
+    pnote = pattern->data;
     for (row = 0; row < nrows; row++)
     {
         for (chn = 0; chn < nchannels; chn++)
@@ -412,7 +411,8 @@
     }
 
     // OK, return pointer to struct
-    return res;
+    return pattern;
+}
 }
 
 
@@ -420,14 +420,13 @@
  */
 JSSInstrument *jssAllocateInstrument(void)
 {
-    JSSInstrument *res;
+    JSSInstrument *inst;
 
     // Allocate a instrument structure
-    res = dmMalloc0(sizeof(JSSInstrument));
-    if (res == NULL)
+    if ((inst = dmMalloc0(sizeof(JSSInstrument))) == NULL)
         return NULL;
 
-    return res;
+    return inst;
 }
 
 
@@ -436,17 +435,18 @@
 JSSExtInstrument *jssAllocateExtInstrument(void)
 {
     int i;
-    JSSExtInstrument *res;
+    JSSExtInstrument *inst;
 
     // Allocate a instrument structure
-    res = dmMalloc0(sizeof(JSSExtInstrument));
-    if (res == NULL)
+    if ((inst = dmMalloc0(sizeof(JSSExtInstrument))) == NULL)
         return NULL;
 
+    // Initialize the requisite fields
     for (i = 0; i < jsetNNotes; i++)
     {
-        res->sNumForNotes[i] = jsetNotSet;
+        inst->sNumForNotes[i] = jsetNotSet;
+        inst->instConvTable[i] = jsetNotSet;
     }
 
-    return res;
+    return inst;
 }