CPU Micron
9 days old
Not in any tracked top chart right now.
Updated 20 Oct 2026 · rankings refresh through the day
DeveloperCHRISTOPHER PHILIP SMITH
CategoryMusic
Price14.99 USD
Released
Rating★ 5.0 (1)
Version1.1.3
Age rating4+
First seen by us
13 Oct 2026
13 Oct 2026Rating
5.0 ★
1 ratings
Measured
CPU Micron on the App Store
App details
App ID
6816639555
Publisher
CHRISTOPHER PHILIP SMITH
On the store since
Oct 2026
Under a year
Minimum OS
iOS 15.0+
Devices
iPad
Content rating
4+
Size
16 MB
Also listed in
Productivity
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
5.0 ★
1 ratings
Measured
Ratings
1
Measured
About CPU Micron
CPU Micron is a schematic-accurate recreation of the analogue synthesiser voice Roland built into the MC-202 in 1983, made for iPad by Central Processing Unit.
Rather than approximating the sound by ear, its DSP is built from the original circuit diagram and the real component values: the CEM3340 oscillator, the IR3109 transconductance filter, the discrete-transistor envelope and the op-amp LFO. Every figure comes from the schematic, from a measurement of a working hardware unit, or from the manufacturer's own service-manual specifications — and where a figure could be both calculated and measured, the two agree.
THE VOICE
• Oscillator with simultaneous saw and pulse, variable pulse width and PWM, and a 2′ to 16′ footage switch
• Sub oscillator one and two octaves down
• Four-pole low-pass filter that self-oscillates into a clean sine at the top of the control, reproduced from the real feedback path
• Discrete ADSR envelope on its real RC time constants, and a triangle LFO with rate and fade-in delay
• TUNE, PORTAMENTO, ACCENT, VOLUME and TEMPO, on a hardware-exact panel
THE SEQUENCER
Reconstructed from the original owner's manual rather than replaced with a step grid: two channels, gate time as a fraction of step time, bars stored as data, and the machine's own key map. A sequence can be written to an audio file and played into the hardware's tape input, or read back from tapes the machine itself recorded - notes, accents, glides, ties and bar lines intact.
APP AND PLUG-IN
CPU Micron is both an app and an Audio Unit (AUv3) plug-in. Play it on its own, or inside GarageBand and other apps that host Audio Unit instruments, with the sequencer following your song's tempo and transport, and your sound and sequence saved with the song.
AND EVERYTHING 1983 LACKED
• Patch and sequence memory, with factory banks of basses, leads and effects
• One library of presets and sequences, shared by the app and the plug-in, with export and import through the Files app for backing up, sharing and moving between devices
• Two randomisers, one for patches and one for sequences, that write something worth keeping
• MIDI CC on every panel control
• Five panel finishes
• The full manual, built in
For iPad, in landscape. No account, no subscription, no network.
Rather than approximating the sound by ear, its DSP is built from the original circuit diagram and the real component values: the CEM3340 oscillator, the IR3109 transconductance filter, the discrete-transistor envelope and the op-amp LFO. Every figure comes from the schematic, from a measurement of a working hardware unit, or from the manufacturer's own service-manual specifications — and where a figure could be both calculated and measured, the two agree.
THE VOICE
• Oscillator with simultaneous saw and pulse, variable pulse width and PWM, and a 2′ to 16′ footage switch
• Sub oscillator one and two octaves down
• Four-pole low-pass filter that self-oscillates into a clean sine at the top of the control, reproduced from the real feedback path
• Discrete ADSR envelope on its real RC time constants, and a triangle LFO with rate and fade-in delay
• TUNE, PORTAMENTO, ACCENT, VOLUME and TEMPO, on a hardware-exact panel
THE SEQUENCER
Reconstructed from the original owner's manual rather than replaced with a step grid: two channels, gate time as a fraction of step time, bars stored as data, and the machine's own key map. A sequence can be written to an audio file and played into the hardware's tape input, or read back from tapes the machine itself recorded - notes, accents, glides, ties and bar lines intact.
APP AND PLUG-IN
CPU Micron is both an app and an Audio Unit (AUv3) plug-in. Play it on its own, or inside GarageBand and other apps that host Audio Unit instruments, with the sequencer following your song's tempo and transport, and your sound and sequence saved with the song.
AND EVERYTHING 1983 LACKED
• Patch and sequence memory, with factory banks of basses, leads and effects
• One library of presets and sequences, shared by the app and the plug-in, with export and import through the Files app for backing up, sharing and moving between devices
• Two randomisers, one for patches and one for sequences, that write something worth keeping
• MIDI CC on every panel control
• Five panel finishes
• The full manual, built in
For iPad, in landscape. No account, no subscription, no network.
Latest updates
1.1.3
CPU Micron is now an Audio Unit plug-in as well as an app, free with the app you already have.
• Play CPU Micron inside GarageBand and other apps that host Audio Unit instruments. Set SEQ to Sync and the sequencer starts, stops and keeps tempo with your song. Your sound, sequence and settings are saved with the song.
• One library for the app and the plug-in: a preset or sequence saved in one appears in the other. Presets you have already saved move across the first time you open the app.
• The library is no longer listed in the Files app. Use Export and Import on the FILE menu to move presets and sequences in and out, and Show exports in Files to find what you've exported.
• Menus respond properly to touch, including FILE ▸ Randomiser ▸ Key and Scale.
• A note held while POWER is switched off no longer comes back stuck on, and controller knobs moved while POWER is off now take effect.
• Knobs and faders move more smoothly.
• The manual has a new On the iPad chapter.
1.0
Store changes
What CPU Micron changed on its store page: name, icon, screenshots, price, size, languages, requirements.
App got bigger
8 MB → 16 MB (+101%)
