increase pitch range, allow "comments" in csv

freude.py

@@ -16,7 +16,7 @@ parser.add_argument("--bpm", default=60, type=float, help="beats per minute")
 args = parser.parse_args()
 
 # starting from C3 = 130.81 Hz
-frequencies = [2 ** (i / 12) * 130.81 for i in range(24)]
+frequencies = [2 ** (i / 12) * 130.81 for i in range(36)]
 # duration of 1/16th beat
 base_duration = 60 / args.bpm / 16
 
@@ -30,9 +30,12 @@ with open(args.output, "w") as f:
     for filename in args.input:
         with open(filename, "r") as notes:
             for pitch, duration, pause in csv.reader(notes):
+                if pitch == "":
+                    # skip comment
+                    continue
                 pitch = int(pitch)
-                if pitch < -12 or pitch > 11:
-                    sys.exit("pitch goes from -12 == C3 to 11 == B4")
+                if pitch + 12 < 0 or pitch + 12 > len(frequencies) - 1:
+                    sys.exit(f"pitch goes from -12 to {len(frequencies) - 1 - 12}")
                 duration = int(duration)
                 pause = int(pause)
                 if duration < 1 or pause < 0: