/* -- get staves definition (%%staves / %%score) -- */
function get_staves(cmd, parm) {
    var	s, p_voice, p_voice2, i, flags, v, vid, a_vf,
	st, range,
	nv = voice_tb.length,
	maxtime = 0

	// if sequence with many voices, load the other voices
	if (curvoice && curvoice.clone) {
		i = parse.eol
		parse.eol = parse.bol		// remove the %%staves line
		do_cloning()
		parse.eol = i
	}

	if (parm) {
		a_vf = parse_staves(parm)	// => array of [vid, flags]
		if (!a_vf)
			return
	} else if (staves_found < 0) {
		syntax(1, errs.bad_val, '%%' + cmd)