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Get a Decoder Buddy, a 21-pin decoder of your choice of brand (I prefer ESU), a speaker (ESU decoders come with a speaker), an enclosure (e.g., ESU sells enclosure packs to build your own or folks like @Lemosteam make 3D prints of enclosures). Then it's just a matter of soldering some wires. The advantage of Decoder Buddy is that (1) it's inexpensive, (2) if you were to somehow ruin it with poor soldering, you have not destroyed the decoder, and (3) once you have the Decoder Buddy and speaker installed, your DCC decoder is plug and play. That B&O F unit is a perfect candidate for your first attempt at installing custom DCC and sound, because it doesn't have a lot of lights or other special effects, and you have tons of room under that cab unit shell.Hope this helps,DFF