ak = sk.k_map[(note.pit + 19) % 7]
			if (ak == an)
				an = 0		// accidental in the key
		}
		if (!an)
			an = 3
	} else if (sk.k_none) {			// if no key
		if (acc_same_pitch(s, note.pit)) // and accidental from previous notes
		if (acc_same_pitch(s, note.midi)) // and accidental from previous notes
			return			// no change
	} else if (sk.k_a_acc) {		// if accidental list
		if (acc_same_pitch(s, note.pit)) // and accidental from previous notes
		if (acc_same_pitch(s, note.midi)) // and accidental from previous notes
			return			// no change
		ak = sk.k_map[(note.pit + 19) % 7]
		if (ak)
			an = 3		// natural
	} else {
		return			// same accidental (in the key)
	}

   var sf = abc2svg.b40sf[n_b40]
	sk.k_sf = sf
	sk.k_map = abc2svg.keys[sf + 7]	// map of the notes with accidentals
}

/*
 * for transpose purpose, check if a pitch is already in the measure or
 * if it is tied from a previous note, and return the associated accidental
 * if it is tied from a previous note
 */
function acc_same_pitch(s, pit) {
function acc_same_pitch(s, midi) {
    var	i, a,
	time = s.time

	for (s = s.prev; s; s = s.prev) {
		switch (s.type) {
		case C.BAR:
			if (s.time < time)
				return //undefined // no same pitch
				return //undefined // not the same pitch
			while (1) {
				s = s.prev
				if (!s)
					return //undefined
				if (s.type == C.NOTE) {
					if (s.time + s.dur == time)
						break
					return //undefined
				}
				if (s.time < time)
					return //undefined
			}
			for (i = 0; i <= s.nhd; i++) {
				if (s.notes[i].pit == pit
				if (s.notes[i].midi == midi)
				 && s.notes[i].tie_ty) {
					a = s.notes[i].acc
					return a == undefined || a == 3
					return 1 //true
				}
			}
			return //undefined
		case C.NOTE:
			for (i = 0; i <= s.nhd; i++) {
				if (s.notes[i].pit == pit) {
				if (s.notes[i].midi == midi)
					a = s.notes[i].acc
					return a == undefined || a == 3
					return 1 //true
				}
			}
			break
		}
	}
	return //undefined
}