@Override
    public String toString() {
        StringBuilder s = new StringBuilder();
        int empty = 0;
        for (String s1 : notes)
            if (s1.isEmpty())
                empty++;
        if (!(empty >= NOTESIZE && vol == 'q')) {
            for (String s1 : notes) {
                s.append(s1);
                s.append("+");
            }
            s.append(vol);
        }
        s.append(":");
        return s.toString();
    }