I was at a Police Show recently and was told it was SoundOff. Might make sense with tri color heads.
Whelen offers trio (Tri coloured heads) technology. I'll hazard a guess to say that it's a Whelen concoction using Tracer trio guts in a vehicle specific shroud. I'd be shocked if it's anything other then Whelen to be honest as in the past the factory optioned warning prep/warning packages have historically been single sourced I.E.
CVPI was Federal Signal, NGPI & First generation Ford Explorer Utility were entirely Whelen.
Be curious to hear an end user or upfitter chime in. If Whelen used something other then Whelen on this second generation of Utility's for the interior bar it would be a first for them as well as the vehicle as all other factory optioned lighting/emergency equipment is Whelen.