The 81 class from Austrains is fitted with an ESU 58420 LokSound V5 8 pin decoder and premium twin speakers from DCCSound.
First, the couplers are removed.
Then, the body assembly is removed via four screws under the floor, one at each corner of the body.
Next, the 8 pin decoder is plugged into the 8 pin socket.
The two speakers are positioned in place.
This particular sound project features recordings of PN 8126.
The model is tested and then reassembly of the body is completed.