You can convert a part of a sound or a music into an appropriate way to play it on a Commodore Plus/4 computer. LUMYDCTT is basically working with WAVE (.WAV) file, so if you would like to use another kind of sounds, first you need to convert it to .WAV.
On the other hand, there is a plugin (fre:ac) in the "plugins"-folder. LUMYDCTT uses this plugin to convert .AU, .AIFF, .SND, .MP3 and .WMA to .WAV.