This is for converting locomotives with a built-in PluX22 interface. It has a 21-pin interface adhering to NEM 658. The märklin SoundDecoder3 supports the digital formats mfx, MM1, MM2, DCC, and RailCom®.
This decoder has preset sound for a diesel locomotive.
A 60970 Märklin Decoder Tester is required for the programming.
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Here you will find a listing of sound files
Here you will find a listing of matching speakers