If you get too many talkgroups in your playlist, you'll never catch up to live. Take a systemwide group like ARMER (
Allied Radio Matrix for Emergency Response (ARMER) - All Calls Live ), calls come in faster than they can playback. If you're listening to a large number of talkgroups, it might be best to distribute them between multiple players ( maybe
@blantonl could look at adding a balance control to player so simultaneous playbacks can come out of different speakers, it is an available control in the <AUDIO> tag)
Of course, one way to counteract the call backup during busy times would also add playback speed control to the player. If one chose to playback calls at 1.5x or 2x (again another control builtin to HTML5 <AUDIO>), the backup that occurs during a long call would be less.