I finished my first sound project using an ESU sound decoder, in this case a LokSound 5 Nano. First of all I have to admit that there is no competence for ESU sound decoders. First of all the decoder comes complete with his speaker already soldered and a very smart way to make the soundbox, with different sized plastic pieces that you glue together to make the soundbox as much taller as the available space.
But it's not only about how well packaged it is, the sound is incredible, really powerful and with no distortion. The decoder is wired for 6 functions, the motor control is smooth and precise, and it has tons of parameters to adjust effects, intensities, sound parameters, random sounds, events,... just awesome!!!
You pay for it, but it really beats any competence.
But let's start the work. First of all open the locomotive and unclip the motor. The motor has two small metallic pieces that won't be used (see them in the second photo, next to the motor):