I'm pretty sure the Signal-Sounds board in that unit is TMCC compatible, so for just whistle & bell, you can run with that until you decide you need full sounds. If you want full RailSounds with chuffing, crew talk, etc., you'll have to buy both the RS Power Supply and RS Audio Board, the Signal Sounds board stands along and does not use the standard RS Power Supply, it has self-contained power. You will note in the upgrade notes in the above manual they specify adding both of the RailSounds boards to replace the Signal Sounds board.
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