Korg microKorg 37-Key Analog Modeling Synthesizer with Vocoder Sound Generation Method: Analog Modeling Synthesis System Synthesizer Program: Multi Timbral=2 (max, Split/Dual Mode) Voices: 4 voices. Power Supply- DC 9 V (AC adapter), or six AA alkaline batteries (sold separately) Arpeggiator: 6 types. Outputs: L/MONO, R, Headphones Compatibility : Windows - 98 Second Edition, Me, 2000 SP2, XP. Mac OS - OSX10.6.8 or later