It is important to acquire the right sound from your sound decoder.
In nowadays there are various sound decoders for different qualities of sound. To obtain a good performance I reccomend a sound decoder from a good sound maker, such as from Matthias Henning, Gorg Breuer, Alexander Mayer, and Heinz Däppen. They are sound makers for german locomotives.
Piko BR 131 022-6 DR 71051 Ludmilla digital DH16A + SH10A-SUSI-Sound Fahrstufe 1Alexander Mayer
Sound decoders and loud speakers are available at my workshop. I also install the parts into the locomatives
Tams offers an interesing glossary to view amongst their broad range of sortiments on electronics for model locomotives. I offer personal advice.