CPU Micron
Synthesiser & sequencer
129,00 kr · Designed for iPad. Not verified for macOS.
iPad
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.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
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.
The developer, CHRISTOPHER PHILIP SMITH, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 16.4 MB
- Category
- Music
- Compatibility
Requires iPadOS 15.0 or later.
- iPad
Requires iPadOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPad
- Age Rating
4+
- 4+
- Provider
CHRISTOPHER PHILIP SMITH
- CHRISTOPHER PHILIP SMITH has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
- Address
36 Green Lane
Dronfield
Derbyshire
S18 2LZ
United Kingdom - Phone Number
+44 7426759888 - Email
input@cpurecords.net
- Copyright
- © 2026 Central Processing Unit
