Hi Genos1957,
No, unfortunately you cannot add reverb or any other effects to an audio file loaded/played on Genos.
One possibility would be to edit the MP3 beforehand in a suitable audio editor, e.g. "
Audacity v3.1.3". There you can generate a reverb (9 adjustable parameters) with "Effect > Reverb" (first
select the entire file by pressing Ctrl + A).
Finally select "File > Export > Export as MP3" to save your edit as a new MP3 file.
Best regards,
Chris