☢ Alesis D4
Drum Module (1991)

Digital drum rack from the nineties based on PCM samples.

The Sample pack contains 500 samples
🎧 Format: 24 bits/ 44 kHz

🎁 Price: FREE! 

▓ acoustic drums ▓
▓ 90 flavor ▓



bassdrum (x99)
snare drum (x99) 
cymbals-hihats (x55) 
tom toms(x92) 
FX effects(x78) 
percussion/chromatics (x76)

■Digital rackmount module based on PCM samples features 12 analog trigger inputs controlled by DYNAMIC ARTICULATION technology.

■ RACKMOUNT single rack unit. Main panel features a 16 X 2 lcd lines display, 12 push buttons, a data encoder and a preview trigger (non-dynamic) pad.

■TECH main core is a 8-bits 8031 / 80C31 MPU which manages 16 voices polyphony - converter DAC is a common 16 bits Burr-Brown PCM54. The D4 sound generation is based on plain PCM samples on the ROM  assigned to a Midi note or a special trigger.The basic sound architecture is the KIT (a kind of patch) composed by up to 61 PCM samples shots. 

■ EDIT basic sound parameters includes panning, pitch tuning and analog out assignment following 4 configurations:
- A: 2 stereo pairs
- B: 1 stereo
- C: 2 mono
- D: 4 mono.

■ TRIGGERS each sound is assigned to one of 12 trigger inputs based on custom DYNAMIC ARTICULATION system technology, compatible with most trigger systems.
Some dedicated trigger parameters matches the drummer playmode behavior:
- sensibility adjustment
- 8 velocity curves
- decay time
- crosstalks: a threshold gate filters nearby pads vibrations

■ MIDI the drum brain works also with standard Midi system but the implementation is rather poor offering just a few Midi CC# like volume, pitch bending and program change.

■ MEMORY 21 RAM user kits
Kits and configuration are saved to SRAM memory - data can be backup to Midi exclusives datas.
Battery replacement: 3V BR-2325 lithium battery soldered to mainboard, replacement involves soldering

■Company: Alesis
Model: D4
Class: Drum Module
Dates: 1991
Synthesis: PCM rompler
Display: 16 X 2 lines
Analog outs: 4 jack
Polyphony: 16 voices
Resolution: 16 bits
N. waves : 541 PCM
Trigger inputs: 12
Memory: 21 kits
ROM: 6 X mask rom
Effects: none
Midi: IN / OUT / THRU
Latest OS: 1.4
CPU: Intel 8031

- main signal output
- AUX output
- 12 jack triggers inputs
- footswitch input for hit-hat control or assignable to other functions
- headphones (front)

■Weight: 2 kg
Dimensions: 43,6 (H) x 483 (W) x 200 (D) mm
Power supply is external AC-AC type 9V / 830 mA original is P-3.

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