MRC Sounders appear to be sound cards that are controlled via the DCC command system, used broadly across 2-Rail trains of all scales, but not so much with 3-Rail trains.
Because it's part of the DCC world this means that there is no single dedicated remote, but a whole range of models from various manufacturers all of which "speak" DCC and can issue the commands that Sounders respond to.
Here's an example from MRC:
However there's also this, from 2018 but apparently no longer available:
The folks in the OGR DCC forum would probably be able to help you better than those of us who waste all of our time in 3-Rail and DCS or TMCC/Legacy.
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