Polyphony varies based on the type of synthesis being used. Each of the dual TI processors can run a single engine of sample playback, FM, virtual analog, reed physical modeling, or wind physical modeling. The polyphony for each processor is (double the polyphony if using the same synthesis type for both processors):
Performance patches are referred to as "mixes".
The 61-key version is the Alesis Fusion 6HD.
Year Released: 2005
Keyboard: 88 keys with velocity and aftertouch
Preset Patches: 512
Preset Performances: 128
Preset Drum Kits: 24
Effects: 57 insert effects, 64 bus effects, and a 4-band master EQ
Power Consumption: 50 watts
Dimensions: 1308 mm x 356 mm x 127 mm
Weight: 25.6 kg
Alesis Fusion 8HD 2007 Grey ($400)