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Acorn Instruments MasterKey 25 Controller Keyboard


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  • 25 note, velocity sensitive, synth-style keyboard
  • Fully assignable pitch bend and modulation wheels
  • 1 assignable fader - use for volume, cutoff or anything else you can think of!
  • 4 assignable knobs for real time control of software parameters
  • 3-character red LED segment display
  • Advanced MIDI functions
  • USB class-compliant - No driver needed
  • Includes Presonus Studio One Artist, a great software package so you can get recording straight away
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  • Flexible finance available on orders over £250
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Delivery & Returns

Delivery to UK mainland addresses* is FREE on orders over £75 and up to 30kg. (As a guide, a standard electric guitar weighs approx. 3-5kg).

Delivery on orders below £75 are charged at £4.45!

Delivery to Northern Ireland, the Scottish Highlands & Islands, Isle of Man, Isle of Wight, Channel Islands and the Republic of Ireland. is weight dependant and will be indicated at the checkout

Delivery above 30kg to ANY location will vary according to weight and will be indicated at the checkout

LocationPriceStandard Delivery
UK mainland*FREE on orders over £75 £4.45 on orders under £751-3 working days
Northern Ireland, Scottish Highlands & Islands Isle of Man Isle of Wight Channel Islands Republic of Ireland£12.95 – any order value up to 30kg Over 30kg - please call1-3 working days
OverseasPlease call for detailsPlease call

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Bringing portable control to any standard MIDI software, or the included Presonus Studio One Artist, the Acorn Instruments MasterKey 25 Controller Keyboard features 25-keys, assignable pitch bend and modulation wheels, an assignable fader, four assignable knobs for real time control, and a 3-digit LED display. You also get a free copy of recording and production platform, Presonus Studio One Artist, to get you started.

25 Velocity Sensitive Keys

Despite its compact design and light weight, the Acorn Instruments MasterKey 25 Controller Keyboard offers 25 velocity sensitive keys, so you don’t have to skimp down on dynamics and response speed when you’re on the road, and ensuring you’re always in full control of bass lines, drums or synth moves.


While playing, you can utilise the four knobs and fader to take control of instruments or parameters, and add articulation with the Acorn Instruments MasterKey 25’s pitch bend and modulation wheels. These wheels, and the fader cap, are outfitted with a rubberised coating, which provides a surface that is more grippable, to reduce slippage. In addition to the 25 keys there are also octave up/down buttons, to quickly shift the keyboard’s range.

The Acorn Instruments MasterKey 25 Controller Keyboard makes it easy to quickly change MIDI channels, send program changes, transpose and programme the keyboard’s other controls, all from the unit’s 3-digit LED display.

Real-time functions

The two buttons just below the LED display (-/+) can be set up to control one of four parameters. By default these are set up to control the octave range of the keyboard (four octaves up/three octaves down). Press the two together and you can scroll through the options with the – and + buttons. This gives you options of having the buttons control Octave, Transpose, Program Change or MIDI Channel. The LED will display the options as you cycle through them.


The Acorn Instruments MasterKey 25 is really easy to set up. It doesn’t need any drivers; the keyboard just plugs in via your computer’s USB port and it’s ready to go, there is also no external power supply either, as it draws power straight from the USB connection.

You can also pair the Acorn Instruments Master Key 25 up with a footswitch via the controller’s input jack, allowing you to hook up a sustain pedal. This automatically detects the polarity of the footswitch, allowing you to connect any standard pedal.

Presonus Studio One Artist

Although the Acorn Instruments MasterKey 25 Controller Keyboard will work with any standard MIDI software, it also comes supplied with a free copy of the entry-level DAW, Presonus Studio One Artist.

Easy to get to grips with, Presonus Studio One Artist makes recording and production easy by bringing all its editing tools to the forefront, rather than keeping them hidden behind countless menus. Alongside giving you unlimited tracks and plug-ins, features not usually available from entry-level DAW software, you can quickly load and save audio clips, MIDI files, effects, and VIs by simply dragging-and-dropping. The same goes for instruments, plug-ins and drum loops, its all available from the software’s content Browser.

One you’ve finished your composition Presonus Studio One Artist also gives you 20 high-quality Native Effects to process your mix through.

Studio One Artist Features

  • Elegant single-window work environment
  • Powerful drag-and-drop functionality
  • Unlimited audio tracks, MIDI tracks, virtual instruments, buses, and FX channels
  • Content browser with convenient sort options and preview player
  • Most intuitive MIDI-mapping system available
  • Real-time audio time-stretching and re-sampling
  • Automatic delay compensation
  • Advanced automation
  • Instantly configures to PreSonus audio interfaces
  • Compatible with ASIO-, Windows Audio-, and Core Audio-compliant audio interfaces
  • 25 Native Effects 32-bit effects and virtual instrument plug-ins
  • 4+ GB of third-party software, loops, and instruments
Model Instruments MasterKey 25 Controller Keyboard
(H x W x D)
57.15 x 469.9 x 190.5 mm
Weight2 kg
Controls 25 note, velocity sensitive, synth-style keyboard
Pitch bend and modulation wheels (assignable)
1 assignable fader
4 assignable knobs for real time control
3-character red LED segment display
Connectors 1 sustain foot switch input jack, type-sensing (foot switch not included)
System Requirements Mac
PowerPC G4 1.25 GHz or Intel Core Solo
1.5 GHz processor
1 GB RAM Recommended hardware: PowerPC G5 or better or Intel Core Duo or Intel Xeon processor or better
2 GB or more RAM

Operating Systems: Windows XP, Windows Vista, and Windows 7/8
Minimum Hardware: Intel Pentium 4 1.6 GHz processor or AMD Athlon 64 (Turion)
1 GB RAM Recommended Hardware: Intel Pentium 4 2.8 GHz EM64T or better or AMD Athlon 64 3000+ or better
2 GB or more RAM
Low latency audio sound card

Windows and Mac
Internet connection
DVD-ROM drive
Included Accessories 6ft USB cable
Manual/User Guide
DVD containing Presonus Studio One Artist and content material
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