bool soloing() const { return _non_soloed_outs_muted; }
bool listening() const { return _listen_cnt > 0; }
bool solo_isolated() const { return _solo_isolated_cnt > 0; }
bool soloing() const { return _non_soloed_outs_muted; }
bool listening() const { return _listen_cnt > 0; }
bool solo_isolated() const { return _solo_isolated_cnt > 0; }