The D4 was an affordable and fully professional Drum and Percussion sound module. It featured 500 drums sounds, sampled at 48kHz and stored on an internal ROM chip. The sounds cover the whole gamut, from great acoustic drum types to electronic drum sounds. Orchestral and ethnic percussion sounds and various percussive effects are also available. There are 21 programmable drum kits as well. And the D4 has full 16-channel MIDI implementation.

SPECIFICATIONS
Polyphony - 16 voices
Drum Sounds - 500 (99 kicks, 99 snares, 55 cymbals, 92 toms, 75 percussion sounds, and 80 effects)
LFO - None
Filter - None
VCA - None
Keyboard - None
Memory - 21 programmable drum kits
Control - MIDI (16 channels) and 12 Trigger inputs and Hi-Hat pedal input
Date Produced - 1991