Add voicings for 7th chords without 3rd and without 5th

This does introduce a few more ambiguities. I need to write a mode
soon to search out and print all the ambiguous chords.

diff --git a/scherzo.c b/scherzo.c
index b0a6414781c75fa71b82471578470c31e0757853..95890bc2500e861bc942233a254a06498dd0ed4d 100644 (file)
--- a/scherzo.c
+++ b/scherzo.c
@@ -665,13 +665,29 @@ scherzo_analyze_chord (scherzo_t *scherzo)
 #define SUP "<span font='33' rise='30000'>"
 #define PUS "</span>"
 
-    struct { modified_degree_t degrees[3]; const char *name; } triads[] = {
+    struct { modified_degree_t degrees[3]; const char *name; } trichords[] = {
+       /* Triads */
        { {{1, 0}, {3, +1}, {5,  0}}, "sus" },
        { {{1, 0}, {3,  0}, {5, +1}}, SUP "+" PUS },
        { {{1, 0}, {3,  0}, {5,  0}}, "" },
        { {{1, 0}, {3, -1}, {5,  0}}, "m" },
        { {{1, 0}, {3, -1}, {5, -1}}, "°" },
-       { {{1, 0}, {2,  0}, {5,  0}}, "msus2" }
+       { {{1, 0}, {2,  0}, {5,  0}}, "msus2" },
+       /* Seventh chords with no 3rd */
+       { {{1, 0}, {5, +1}, {7,  0}}, SUP "+M7" PUS },
+       { {{1, 0}, {5, +1}, {7, -1}}, SUP "+7" PUS },
+       { {{1, 0}, {5,  0}, {7,  0}}, "M7" },
+       { {{1, 0}, {5,  0}, {7, -1}}, "7" },
+       { {{1, 0}, {5, -1}, {7, -1}}, "7♭5" },
+       /* Seventh chords with no 5th */
+       { {{1, 0}, {4,  0}, {7,  0}}, "M7sus" },
+       { {{1, 0}, {4,  0}, {7, -1}}, "7sus" },
+       { {{1, 0}, {3,  0}, {7,  0}}, "M7" },
+       { {{1, 0}, {3,  0}, {7, -1}}, "7" },
+       { {{1, 0}, {3, -1}, {7,  0}}, "m" SUP "M7" PUS },
+       { {{1, 0}, {3, -1}, {7, -1}}, "m7" },
+       { {{1, 0}, {2,  0}, {7,  0}}, "m" SUP "M7" PUS "sus2" },
+       { {{1, 0}, {2,  0}, {7, -1}}, "m7sus2" },
     };
 
     struct { modified_degree_t degrees[4]; const char *name; } tetrachords[] = {
@@ -849,12 +865,12 @@ scherzo_analyze_chord (scherzo_t *scherzo)
            }
            break;
        case 3:
-           for (i = 0; i < ARRAY_SIZE (triads); i++) {
+           for (i = 0; i < ARRAY_SIZE (trichords); i++) {
                if (_chord_signature_matches (notes, num_notes,
-                                             triads[i].degrees, 3,
+                                             trichords[i].degrees, 3,
                                              inversion, &root))
                {
-                   chord_name = triads[i].name;
+                   chord_name = trichords[i].name;
                    goto CHORD_NAME_KNOWN;
                }
            }