Yes you seh.........if you set the channel audio type to "all", instead of specifying "digital only" or "analog only", you may experience motorboating. The RCS digital talkgroups are DIGITAL ONLY, so if you set the talkgroup to "all", it will expect the possibility of ANALOG, and allow the squelch to open to CARRIER. You are hearing the talkgroup being allowed to pass the analog carrier while the scanner determines it is DIGITAL audio and making the conversion.
Also, the RCS transmits 25KHz wideband FM. Obviously P25 is NFM only, but the analog stuff is not NFM.
Paul