Sophisticated midi expander in very good order and suitable for accordion.
Graphic display (illuminated), 128 GM midi instruments 16 custom voices.  Variations for sounds, drum kits, volume, octave, transpose, vibrato delay.  72 patterns or styles, rhythms, chords, key start,. Mixer, harmonizer, disk, vocorder,  saving locations, reverb various types, chorus various types, delay, other inputs e.g microphone with processor effects.
Connections -outputs left and right, headphones, pedals, midi in / out / through.