Roland - RA-50 Real Time Arranger - Second Hand
In good condition, comes with a Roland TN-SCI-04 Music Style Card.
The RA-50 is a MIDI expander box, designed to upgrade a synthesiser or keyboard to be a one-person-band with automatic backing tracks & powerful synth sounds and reverbs with 32 preset music genres that will 'intelligently' expand your chords into a full on ensemble. Works perfectly on its own as well.