It belongs to the "Akai White Series", a family of musical products launched in the last part of the 1980s.
Numerous variations may be created by adjusting the pre delay and the reverb time settings on the front panel.
Programs may be selected by MIDI, a foot switch, or the infrared remote control accessory.
The technical specification of the AR900 are as follows:[1] According to an article from the French version of Keyboard magazine of September 1989:[2] The AR900 offers a realtime stereo Spectrum Analyzer.
An extension of the EQ tool, the analyzer's frequencies are represented graphically on the LCD, with each dot having a precision of 3db, when used in stereo, and 1.5db when used one channel at a time.