private static List<Line> getAvailableLines(Mixer mixer, Line.Info[] lineInfos) {
		List<Line> lines = new ArrayList<Line>(lineInfos.length);
		for (Line.Info lineInfo : lineInfos) {
			Line line;
			line = getLineIfAvailable(mixer, lineInfo);
			if (line != null) lines.add(line);
		}
		return lines;
	}