Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsiTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
If REAPER does not show your MIDI keyboard or does not respond to it, the cause is almost always one of three things: the keyboard is not reaching the computer in a way the system recognizes, REAPER has not been told to listen to it, or the track is not set up to receive from it. Check them in that order. Each step below is taken from REAPER’s official User Guide (version 7.81) and its Troubleshooting Guide, and the menu paths are the ones those documents give.
Step 1: Confirm the physical connection and power
REAPER can only use a keyboard that the operating system already sees. Before changing anything in REAPER, confirm that:
- the keyboard is switched on and, if it has its own power supply, that supply is connected;
- the cable is seated at both ends and, for USB, is plugged into a working port on the computer rather than a passive hub that may not pass MIDI data reliably;
- if the keyboard connects through an audio device, the audio device is powered and its MIDI input is the port the keyboard is cabled to.
If the keyboard does not appear in REAPER and the computer or audio device also does not recognize it, the problem is in the connection, not in REAPER. Fix that first; REAPER preferences cannot help with a device the system does not report.
Free tools Windows power users keep installed
One-click scans. No signup required.
Step 2: Enable the keyboard in REAPER’s MIDI Inputs list
A connected keyboard is still ignored until REAPER enables it. In the REAPER User Guide (v7.81) the device list is reached this way:
#1 Best Overall
- Next-Gen Music Production and Beat Maker Essential - USB-powered MIDI keyboard controller with 25 mini velocity-sensitive keys, optimized for studio or beat production, piano-style performance, synth leads, sample triggering
- Real-Time Control and Navigation - 8x assignable 360° knobs, a vibrant full-color screen and push/turn encoder for hands-on access to settings, presets, and DAW functions, without reaching for a computer
- Iconic MPC Pads with RGB Feedback - 8 velocity- and pressure-sensitive MPC pads deliver an iconic finger-drumming experience, plus dynamic visual feedback to match your performance in studio or on the go
- Studio Instrument Collection Included - A powerful VST/AU and standalone virtual suite packing 1000+ pro-grade drums, keys, synths, bass, FX from AIR, Akai Pro and Moog, plus MPK Mini IV integrated controls
- Pre-Mapped DAW Integration - Get producing in under 15 minutes with Ableton Live Lite 12, Logic Pro, FL Studio and more; comes with an expanded DAW-mapped transport section for uninterrupted workflow
- Open Options > Preferences.
- Go to Audio > MIDI Inputs. Labels can shift between REAPER versions and platforms, so if you do not see this exact heading, look for the MIDI device list under the Audio section.
- Find your keyboard in the list and enable it for track recording input.
- Enable the separate control-message option only when the keyboard is meant to act as a controller surface or send control input. For ordinary playing and recording, leave it off.
Step 3: Set up the track to receive the keyboard
Enabling a device in Preferences does not route its notes to any track. Each track needs its own settings:
- Select the track you want to record or play with.
- Open the track’s MIDI input selector and choose your keyboard.
- Arm the track for recording.
- Turn on input monitoring if you want to hear a virtual instrument on the track while you play.
- Where the guide’s example applies, choose the relevant source MIDI channel and the mapped output channel.
Step 4: Check the MIDI channel and the instrument
If the track is armed, the keyboard is selected, and still no notes arrive, the most common remaining cause is a channel mismatch:
Rank #2
- Full Creative Control - A dynamic 37-Key MPK Mini keybed for 3 full octaves of melodic and harmonic performance; Easily connect to your DAW or studio equipment with the USB-powered MIDI Controller
- Advanced Connectivity - Connect to different sound sources with CV/Gate and MIDI I/O; Control modular gear, sound modules, synthesizers, and more to bring new sound sources into your music production
- Native Kontrol Standard (NKS) Integration - Akai Professional and Native Instruments have partnered to bring NKS support to the MPK Controller series, get ready to Kontrol straight from your MPK
- Choose Your Exclusive Complimentary NKS Bundle - Browse and control Native Instruments presets and sound libraries; select one of three curated Komplete 15 Select bundles: Beats, Band, or Electronic
- Record and Compose Without a Computer - Connect to your production station and use the built-in 64-step sequencer featuring one track for drums and one for melodies or chords, with up to 8 notes each
- Check which MIDI channel your keyboard transmits on. If the track’s source channel is set to a different channel, notes will be filtered out.
- If a plug-in instrument is on the track, confirm that it is set to listen to the same MIDI channel.
- Make sure the track is not muted and that the instrument’s output is routed to a monitored output.
Step 5: Resolve device-open errors
When REAPER reports that it cannot open a MIDI device, the Troubleshooting Guide points to three causes, and you can check them in this order:
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →- The device is disconnected or unpowered. Reconnect the cable and power the keyboard, then reopen the device list.
- Another program is using the device. Quit other music applications, DAWs, editors, or MIDI utilities that may have the keyboard open, then try again.
- REAPER is running twice. Close every REAPER window and confirm that no second instance is still running before you start REAPER again.
Use REAPER’s virtual keyboard to narrow the fault
REAPER’s virtual MIDI keyboard can tell you whether the fault is in your hardware or in REAPER’s configuration. Play it on a correctly configured, armed track. Then compare the results:
Rank #3
- Music Production and Beat Maker Essential -USB powered MIDI controller with 25 mini MIDI keyboard velocity-sensitive keys for studio production, virtual synthesizer control and beat production
- Total Control of your Production - Innovative 4-way thumbstick for dynamic pitch and modulation control, plus a built-in arpeggiator with adjustable resolution, range and modes
- Native Kontrol Standard (NKS) Integration - Akai Professional and Native Instruments have partnered to bring NKS support to the MPK Controller series, get ready to Kontrol straight from your MPK
- Choose Your Exclusive Complimentary NKS Bundle - Browse and control Native Instruments presets and sound libraries; select one of three curated Komplete 15 Select bundles: Beats, Band, or Electronic
- The MPC Experience - 8 backlit velocity-sensitive MPC-style MIDI beat pads with Note Repeat and Full Level for programming drums, triggering samples and controlling virtual synthesizer / DAW controls
| What you observe | Most likely cause | Where to check |
|---|---|---|
| Physical keyboard is missing from the MIDI Inputs list | Not connected, unpowered, or not recognized by the operating system | Cable, port, power, and the system’s own device list |
| Keyboard is listed but REAPER cannot open it | Device is in use by another program, or a second REAPER instance is running | Close other MIDI software and any extra REAPER windows |
| Keyboard is enabled and selected, but no notes arrive | Track input, arming, monitoring, or MIDI channel is wrong | Track MIDI input, record arm, input monitoring, source channel |
| Virtual keyboard works on the track, physical keyboard does not | Physical connection or device recognition | Steps 1 and 2 above |
| Virtual keyboard does not work either | Track configuration or REAPER’s audio and instrument setup | Track arming, monitoring, and the instrument on the track |
Choosing a connection route
The guide describes two basic ways to connect a MIDI keyboard: directly to the computer, or to a MIDI input on a sound card or audio device. Which one applies depends on the ports your keyboard actually has.
| Connection route | When it applies | What to confirm |
|---|---|---|
| Direct USB | Keyboard has a USB port that the computer reports as a MIDI device | The operating system lists the keyboard as a MIDI device |
| 5-pin MIDI through an audio device | Keyboard has a 5-pin MIDI output and your audio device has a MIDI input | The audio device’s MIDI input is active and the cable goes to that port |
| USB MIDI interface (conditional) | Keyboard has 5-pin MIDI output but no direct USB MIDI connection, and you have no audio device with a MIDI input | Your keyboard’s ports and the interface’s MIDI input and output match your cabling |
A USB MIDI interface is only needed when the keyboard has no other route to the computer. Check the keyboard’s rear panel and manual before buying one. This is an inference from the documented connection paths, not a recommendation from REAPER’s developers.
Rank #4
- Full Creative Control - A dynamic 37-Key MPK Mini keybed for 3 full octaves of melodic and harmonic performance; Easily connect to your DAW or studio equipment with the USB-powered MIDI Controller
- Advanced Connectivity - Connect to different sound sources with CV/Gate and MIDI I/O; Control modular gear, sound modules, synthesizers, and more to bring new sound sources into your music production
- Native Kontrol Standard (NKS) Integration - Akai Professional and Native Instruments have partnered to bring NKS support to the MPK Controller series, get ready to Kontrol straight from your MPK
- Choose Your Exclusive Complimentary NKS Bundle - Browse and control Native Instruments presets and sound libraries; select one of three curated Komplete 15 Select bundles: Beats, Band, or Electronic
- Record and Compose Without a Computer - Connect to your production station and use the built-in 64-step sequencer featuring one track for drums and one for melodies or chords, with up to 8 notes each
Version and platform notes
- The menu paths above are from REAPER User Guide v7.81. The REAPER download page lists version 7.82 as the current release, so labels may differ slightly in your copy.
- REAPER’s download page lists support for Windows through Windows 11, Linux on Intel and ARM, and macOS through macOS 26. Device behavior can still depend on the operating system’s own MIDI drivers.
If you have gone through every step and the keyboard still does not appear in the MIDI Inputs list, the problem is usually at the driver or hardware level, and the next useful check is whether the operating system itself sees the keyboard.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Quick Recap
Best Value
- Mini Keys, Major Performance - 25-key MIDI controller keyboard with responsive keys to play with feel and dynamics; Enjoy expressive songwriting, composing, jamming, playing melodies, bass lines, and more
- Full Range Experience - Play every note with ease; Use the dedicated octave up and down buttons to transpose the range of your software instruments plus a sustain button for expressive performances
- Feature Packed - Use the built-in arpeggiator and clock for creative control of any of your sound sources like software instruments, synthesizers, or USB-enabled modular gear, all by one USB cable
- Customized Production - With 8 programmable preset slots you can instantly recall your mappings for DAWs, virtual instruments, and more; Create, edit, and manage all your presets from the computer
- Versatile Performance - The USB Studio MIDI controller is perfect for your songwriting, beat-making, and DJ remixes whenever you're inspired; The sleek design fits alongside your studio equipment
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
