I've heard what you're mentioning with LBFD dispatching. It seems they now assign a repeated "command" channel and a simplex "tac" channel with larger responses. It's possible that what you heard was "respond on command-2, tac-5", which would mean LOB V-2 command and LOB V-5 tac. (LOB is the mutual aid abbreviation for Long Beach in radio alpha tags).
Edit: forgot to mention that they also make use of FCA V-1 as a RIC channel. This is channel 10 in LBFD radios.