XG-909 is a virtual drum machine that brings the power of 'X0X' style pattern-sequencing to any synthesizer compatible with the Yamaha XG, Roland GS, or General MIDI standards. XG-909 features dynamic control over all XG and GS sound parameters through the use of NRPN MIDI messages, as well as access to any two drum kits simultaneously. Other features include shuffle, flam, and echo algorithms, rock-solid timing, and MIDI file export.