The request of reverb or others ambiant effects or equalizing often appears in this thread but can the module really do that?
Reverb could be done by many small echos which are dying out slowly for big rooms and fast for small rooms. EQ should be relative easy. Even the first small mp3 players have EQ. There are 3 knobs and three buttons so it could be built something like this:
Low - Button for some sweetspots and knob for dB+-
Middle - Button for some sweetspots and knob for dB+-
High - Button for some sweetspots and knob for dB+-