MAAS is an easy-to-use high quality realtime MIDI arranger software - Windows Shareware $24.50. MIDI Auto-Accompaniment Section is a software which offers all major features of a high quality MIDI keyboard. It comes with realtime chord recognition, style manager, song arranger, recording section, up to 16 fingered and 10 two-finger chord types, MIDI controls and about 30 demo styles.

MAAS is an easy-to-use improvisation tool and a great aid to practise songs and melodies; a complete backing group for keyboarders, guitar players, bass players and soloists.