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Alesis Andromeda A6

16 voices Real Analog Synthesizer (2000) 

Alesis Andromeda

"The A6 is a 16-voice digitally-controlled analog synthesizer developed by the ex-Oberheim Xpander and Matrix 12 team"

 Main Data 


- Keyboard: FATAR 61 keys
- Designed by: Axel Hartmann
- 72 knobs + 144 buttons
- Display Type: LCD backlit 
- Dimensions (W x D x H): 1019mm x 122mm x 409mm
- Country: USA 
- Weight: 47 lbs / 21 kg
- Controls: Aftertouch, Modulation - Audio Input, Knobs, Mod - Wheel, Pitch -Wheel, Mod - Ribbon, Pedal - Sustain, Velocity, Pedal - Volume 

Polyphony: 16 voices
Timbrality: 16 parts
Modes: Mono, Polyphonic, Split, Unison
RAM: 128 Patches + 128 Multipatches
ROM: 256 Patches
Storage: PCMCIA media
ADC AL1101
DAC AL1201 

Back panel connectors:

Audio Output Connections: 1/4" Phone Jack, Stereo Main, Stereo Headphone
- 10 audio outs 
- Stereo main signal out
- Headphones  out
- Stereo inputs
- CV control voltage I/O


- No official VST plugin
- no known samples library

Have some andromeda sample set you want to share? CONTRIBUTE :) 

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 In details 

ASIC voice board

Motorola 32 bits Coldfire processor (MCF5307B 90MHz ) on the Main board.  There is a secondary processor  87C52 running code from an EPROM.  The analog sounds are generated from 8 Oscillator ASICs that feed 8 Filter ASICs. Each ASIC  contains two voices. It is reported that ASIC chips creates the "VCO dead voices" problem, and there is actually no spare parts.
- ADC AL1101 
- DAC AL1201

OSCILLATOR  each voice is composed by 2 digitally-controlled syncable oscillators (+ possible sub) with variable shapes: Sawtooth Down, Sawtooth Up, Sinewave, Square, Sub Oscillator, Triangle and ringmodulation. The oscillators can drift by temperature, but an auto-tune function is implemented.

The Osc Modulation can be trigger by various sources: After Touch, Continuous Controller, Envelope, Keyboard, Knob, LFO, Mod Wheel, Oscillator, Pitch Wheel, Glide / Portamento, Ribbon, Velocity.


FILTER   Taking inspiration from iconic Moog modes (Moog 921 A e B  at 4-pole) and SEM (state variable 2-pole), the Andreda offers filter -12dB Slope, -24dB Slope, band, notch 6, high pass, low pass, resonance, with pre/post send.
Andromeda also provides external audio inputs that allow you to route any signal through its filters. 

Alesis filter
main panel

 a powerful set of  3 X 7-stage, 3-level digital envelopes with great flexibility with variable segment loop modes.


LFO up to 3 modulator with Noise, Sample & Hold, Saw Up, Sine, Square, Delay, Freerun, Key Sync, Phase

MATRIX MODULATION : 71 sources+ 92 destinations.

Arpeggiator (multiple layer)  up, down, up/down with latch mode and octave set.

Sequencer: classic 16-steps analog style with transpose, variable dynamic and legato modes.

SYNC both arpeggiator and sequencer can be locked to external MIDI clock but this often goes out of sync, which is quite irritating.

FX section

EFFECTS hybrid FX generation:

- Analogue: distortion overdrive
- Digital: reverb, delay, chorus, flanger, pitch-shifter and rotary leslie

- Program Memory: 256 preset +  128 free slots RAM
- Performance Memory: 128 RAM SLOTS 
Sounds can be saved to external PCMCIA-format.

Andromeda battery replacement: a soldered CR2032, place a holder for quick replace.

Alesis ANDROMEDA battery replacement

"Who Says Too Much Adrenaline is a Bad Thing?"
Andromeda slogan

Our Verdict 

" Huge machine with big big sound ...but buggy OS and left like an unfinished (too) expensive project. Furthermore dead voice Asic is a big issue you should consider before buying one. "





Quality / 



- unreliable
- buggy OS
- big bulky guy


- great sound
- versatility

Are you an Andromeda fan? how do you use it? You do not agree with our review?  Let us know in the comment field just below 


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Alesis Andromeda
75 out of 100 based on 1 user ratings
1500 to 2500 from 1 sellers Sellers: