Akai Professional XE8 Midi Drum Expander rack unit, made in Japan, ser. no. 31155-03435, with SL801R Dry Set and SL802R Ambient Set sound library cards
Akai Professional XE-8 MIDI Drum Expander Module | eBay
akai xe-8 , incl 2 soundcards .. ambience - dry set; quick vieuw & listening tru program switching - YouTube