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Alesis Micron 

Analog Modeling Synth (2004)

Alesis Micron

"Portable virtual analog modeling synthesizer with opened synthesis system.
An Alesis ION cut-down version , complex, digital, cold and fascinating machine"

 Main Data 

Alesis Micron and Ion

Company: Alesis
Model: Micron
Class: Synthesizer
Dates: 2004
Keys: 37
Display: 16x2 LCD green
Country: USA
Weight: 3,5 Kg
Dimensions: 577,85 (d) x 69,85 (h) x 196,85 (w) mm
Price: 200€

Synthesis: Virtual Analog
Synthesis: DSP
Resolution: 24 bits
Polyphony: 8 voices
Multitimbric: 8 parts
Oscillator: 3 digital
Filter: 2 Digital multimode
LFO: 2 modulators
Envelope: 3 EGs
Memory: 500 RAM slots
Effects: 2 DSP
Arpeggiator: yes
Sequencer: yes
Sync: Midi Clock
CPU: Coldfire
OS: latest 1.10?

37 velocity non-weighted, keys. Main panel features a display, 4 knobs, 12 buttons, an encoder, a pitch wheel and 2 assignable modulation sliders.

Rear panel terminal connectors:
- Midi interface
- main out signal + headphones
- external signal line input
- damper pedal input
- expression pedal input

Power supply is an external PSU 9VAC-AC 1.5A (NOT DC!).

if you have some CONTACT US

Alesis MICROn FACTORY Reset : Power on while holding: "OCTAVE DOWN", "PROGRAM", and "SETUP" 

- No official VST plugin
- no known samples library

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

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In details

main panel

 Coldfire processor manages 8 voices polyphony.  A voice is composed by 3 digital oscillators with individual settings:
- octave set +  fine pitch tuning
- mix level  + stereo panning position
- monophonic with portamento and glissando
- stacked voice option (up to 8 in unison mode) + analog drift which emulates a VCO temperature drift.

OSCILLATOR   synthesis system is based on 3 digital oscillators plus a pink / white noise; a special waveshape smooths progressively a wave to pure sinewave.
The oscillators feature 3 waveforms:
- triangle / sawtooth
- sinewave
- pulse with variable width.

OSC harmonic contents can be altered by 4 processes:

Digital oscillator
  1. FM frequency modulation :an oscillator controls the frequency of another with variable depth. The FM offers 6 presets models (3 linear + 3 exponential) 
  2. Ringmodulator is quite standard "effect" with variable depth for typical metallic sound-like results
  3. Hardsynch master osc restarts the period of the slave one following 2 modes:                      osc 2 -> osc 1 + osc 2 osc 3 -> osc 1 + osc 2
  4. Softsynch  blends more smoothly the harmonics, also 2 different pathmodes:                      osc 2 -> osc 1 osc 2 + osc 3 -> osc 1
Alesis Micron

PERFORMANCE these are the "setups" with several playmode features:
- 2 split zones
- octave shift
- patterns: special looped sequences or arpeggios
- rhythms programmed drum loops
- 3 curves playmode: linear, exponential and logarithmic

FILTER   2 multimode indipendent resonant digital filters at 2/3/4/6/8 poles. Up to 21 filter models including standard classic like 2/4 lowpass and special ones like formant or special resonance. Filters can be chained in any order in parallel or series, and special prefilter function defines the amount of sources send to the filters. FULL LIST 

ENVELOPE Each EG is defined by a 4-segment ADSR plus some 2 extra parameters: attack and decay have different a linear or exponential initial shape and once an EG is engaged, the segments can be looped at definable points or retriggered from start or left in continous free flown mode.
EG1 amplitude  / EG2 filter  / EG3 pitch / AUX modulation (assignable).

LFO  teach OSC features bipolar 2 modulators (frequency range: 0,010 – 1000 Hz) with same specs:

- triangle + 90 degrees phase shifted variation
- saw + 90 degrees phase shifted variation
- sine + 90 degrees phase shifted variation
- square + 90 degrees phase shifted variatio

LFO modulation


- LFO waveforms
- aftertouch
- EG1-2-3
- assignable sliders
- wheels
- velocity
- random
- expression pedal
- portamento level
- sample & hold

 pitch osc1-2-3
- pitch whole/individual with limited octave range
- amplitude
- osc waveshape
- FM amount
- ringmodulation / noise amount
- portamento
- filter
- pan
- EG
- sample & hold 

classic edit functions: velocity edit, duration change, move note, cancel (...) user patterns can be recorded in real-time or step by step. The special drum editor works in real-time or uses the special grid mode: 1/4, 1/2, 1, 2 or 4 bars and resolution at 8, 12, 14, 16, 20, 24, or 32 step per bar.

ARPEGGIATOR  this functions includes 6 arpeggio motions:  up, down, up and down, up + inclusive (pendulum mode), down + exclusive (does not play lowest and highest notes) and octave jump.

SYNC arpeggiator, drums editor and sequencer can be synched internally or by Midi clock.  Tempo frequency can be set manually or defined by tap tempo. 

EFFECTS   3 DSP sections:
- FX1: chorus, flanger, phaser and a 40-band vocoder (derived from Alesis Metavox effect)
- FX2: delay (mono or stereo) and reverb (plate, room and hall). 
- FX3 boost: FX1 + FX2 outputs can be boosted by distortion, overdrive, fuzz and compressor

- 500 ROM presets 
- 500 RAM patches slots 
- 200 rhythm patterns.


Hypersynth editor


Ctrl editor

Editor for AKAI MINIAK and Alesis Micron FREE! 

Our Verdict 

" A complicated machine! sound is for sure interesting and rich. Synthesis routing system is quite impressive but edit interface and tiny keyboards are awkward. A LOT of power, trapped in this little silver box. A too soon forgotten machine."






Quality / 



- deep edit is painful
- lacks charm


- cheap now
- flexible synthesis

You do not agree with our review? 
Let us know why in the comment field just below 


Alesis Micron  Related  + gallery

"Our first product in the line was our A6 Andromeda, a true analog synth considered by many to be the most powerful non-modular analog synthesizer ever made. Next came the Alesis Ion, praised as one of the most powerful and best sounding Analog Modeling synthesizers ever"
(from Micron Manual by modest guys at Alesis group)

Alesis Micron
72 out of 100 based on 1 user ratings
150 to 200 from 1 sellers Sellers: