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def setupTuning(tuning, num_frets):	global notes, DEBUG	startNotes = tuning.split("-")	guitarStrings = []	for baseNoteStr in startNotes:		current_string = []		baseNoteInt = notes[baseNoteStr]		for fret_num in range(num_frets):			#there is no note larger than 12, so wrap around to 0.			fret_note = (baseNoteInt + fret_num) % 12			current_string.append(fret_note)		guitarStrings.append(current_string)	if DEBUG:		print guitarStrings	return guitarStrings