microsoft/MIDI

View on GitHub

Windows MIDI Services

Stars: 680
Forks: 73
Open beginner issues: 0
Indexed issues: 55
Avg merge: 4h 51m
Merged PRs (30d): 59

Dominant language: C++
License: MIT
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

Open All

54 open issues indexed

[Feature] Add support for 0xF5 port select common messages (Cable select messages in Yamaha terms) to Midi 1.0 loopbacks Open

feature request :bulb:

microsoft/MIDI#1217 · 7 comments · 1 reaction · 1 assignee · Opened Sep 18, 2026
[BUG]: In In-box Preview 7 and 8, changing the name of a basic loopback endpoint results in a never-ending wait spinner. Open

fixed-awaiting-public-release :clock10:

microsoft/MIDI#1210 · 1 assignee · Opened Sep 14, 2026
[BUG]: Name disambiguators don't kick in with duplicate devices if they are using different drivers/transports Open

area-service-or-api :desktop_computer:

microsoft/MIDI#1205 · 1 assignee · Opened Sep 13, 2026
[BUG]: Opening a MIDI connection raises the client application's process priority class to HIGH (MidiXProc MMCSS fallback) Open

area-service-or-api :desktop_computer:

Difficulty 3/5 1-2 days Newbie friendliness 75/100

microsoft/MIDI#1197 · 1 comment · Opened Sep 12, 2026
[BUG]: A stalled driver wedges WinMM MIDI open/close machine-wide — unbounded RPC and global locks give it unlimited blast radius Open

needs-investigation :mag:

microsoft/MIDI#1195 · 1 assignee · Opened Sep 11, 2026
[TODO]: Service cannot be stopped while a client holds a connection (management app polling, and likely WinMM ports) Open

area-service-or-api :desktop_computer: needs-investigation :mag:

microsoft/MIDI#1174 · 1 comment · 1 assignee · Opened Sep 6, 2026
[Tracking] BLE MIDI 1.0 Device Compatibility tracking Open

microsoft/MIDI#1173 · 2 comments · 1 assignee · Opened Sep 6, 2026
[TODO] [Perf] `CMidiPorts` lock contention stalls the WinMM MIDI send path during device changes Open

optimization :comet: todo 🗃️

microsoft/MIDI#1169 · 1 assignee · Opened Sep 4, 2026
[BUG]: Session context handles can collide after vector erase and slot reuse Open

area-service-or-api :desktop_computer: bug :lady_beetle:

microsoft/MIDI#1152 · 6 comments · 1 reaction · 2 assignees · Opened Aug 31, 2026
[BUG] Line 6 products (various models) work with UMP-aware tools, but not with MIDI 1 tools Open

needs-investigation :mag:

microsoft/MIDI#1146 · 2 comments · 1 assignee · Opened Aug 25, 2026
[BUG]: Timing clock issue with native UMP device like the Kontrol MK3 Open

needs-investigation :mag:

microsoft/MIDI#1111 · 1 comment · 1 assignee · Opened Aug 10, 2026
[BUG Parent] In-use MIDI Device Disconnect Parent Open

microsoft/MIDI#1082 · 1 comment · 1 assignee · Opened Jul 29, 2026
[BUG]: Using incorrect association id in a remove op for basic loopback causes service instability Open

area-transports :bus: needs-investigation :mag:

microsoft/MIDI#1081 · 1 reaction · 1 assignee · Opened Jul 29, 2026
[BUG]: All KS hardware endpoints lost after USB dock swap; in-box usbaudio.sys and USBMidi2.sys both affected #AIgenerated Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/MIDI#1071 · 6 comments · Opened Jul 27, 2026
[BUG]: Polyend Play issues (KB5101650 (26200.8875) regresses class-compliant USB MIDI 1.0 devices: rebound to USBMidi2 driver yields no UMP endpoint; usbaudio.sys fallback dies after ~88 sent messages #AIgenerated (Fable 5)) Open

bug :lady_beetle: needs-investigation :mag:

microsoft/MIDI#1061 · 5 comments · 1 assignee · Opened Jul 21, 2026
[BUG]: Marshall firmware update fails with certain CODE amps Open

area-transports :bus: area-winmm needs-investigation :mag:

microsoft/MIDI#1044 · 1 comment · 1 assignee · Opened Jul 14, 2026
[BUG]: Some USB MIDI port of MIDI 1.0 device of which the number of Input ports and output ports differs seem not to work when using USBMidi2-ACX. Open

area-usb-driver :computer: bug :lady_beetle:

microsoft/MIDI#1043 · 3 comments · 1 assignee · Opened Jul 13, 2026
USB MIDI2-ACX Driver incoming SysEx messages potentially wasted UMP Space with MIDI Baby Gen 4 Open

area-usb-driver :computer: needs-investigation :mag:

microsoft/MIDI#1042 · 1 assignee · Opened Jul 11, 2026
[BUG]: USB MIDI2-ACX Driver incoming SysEx dump corruption (SysEx Framing issue?) with MIDI Baby Gen4 Open

area-usb-driver :computer: needs-investigation :mag:

microsoft/MIDI#1041 · 4 comments · 1 assignee · Opened Jul 11, 2026
Devices with non-unique / unreadable USB serials (e.g. M-VAVE / MVAVE ) produce wrong endpoint identity — the classic stack degraded more gracefully Open

external-caused-break 🛸

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/MIDI#1039 · 12 comments · Opened Jul 8, 2026
[TODO]: Make WinMM and WinRT MIDI 1.0 resilient to midisrv restarts for apps/services with open sessions Open

area-windows-internal :window: area-winmm

microsoft/MIDI#1037 · 3 comments · 1 assignee · Opened Jul 3, 2026
[TODO]: Add device customization re-connect feature to MIDI Settings app Open

area-user-tools :gear: fixed-awaiting-public-release :clock10:

microsoft/MIDI#1026 · 1 assignee · Opened Jun 8, 2026
[BUG]: Code Index Number for System Realtime Messages in USB MIDI Packet seems to be wrong when using USBMidi2-ACX Open

area-usb-driver :computer: bug :lady_beetle:

microsoft/MIDI#1025 · 1 comment · 1 assignee · Opened Jun 4, 2026
[BUG]: Windows update broke InstanceId Open

area-windows-internal :window: bug :lady_beetle:

microsoft/MIDI#1020 · 7 comments · 1 assignee · Opened May 29, 2026
[BUG]: Unable to update firmware on TE KO II using Web MIDI Open

needs-investigation :mag:

microsoft/MIDI#1017 · 1 comment · 1 assignee · Opened May 20, 2026
[BUG]: Cannot restart MIDI service if there are open WinMM or WinRT MIDI 1.0 clients Open

area-service-or-api :desktop_computer: area-winmm

microsoft/MIDI#1016 · 1 comment · 1 assignee · Opened May 20, 2026
[DOCS]: Add a page on how unique ids / iSerialNumber works and why it is important Open

todo 🗃️

microsoft/MIDI#1009 · 1 assignee · Opened May 11, 2026
[BUG]: midi.exe monitor does not decode Discovery messages (and other minor message decoding issues) Open

area-user-tools :gear:

microsoft/MIDI#1004 · 1 assignee · Opened May 1, 2026
[BUG]: Feedback messages from Resolume Arena are somehow incompatible with either KSA or our older MIDI 1 driver. Open

area-transports :bus: needs-investigation :mag:

microsoft/MIDI#996 · 1 assignee · Opened Apr 16, 2026
[Feature]: Consider creating a Windows MIDI Services Unity plugin Open

help wanted :mega:

Difficulty 5/5 Over a week Newbie friendliness 30/100

microsoft/MIDI#978 · Opened Apr 8, 2026
[BUG]: Inter-application MIDI no longer received after receiving app is closed and reopened a few times Open

area-service-or-api :desktop_computer: area-winmm bug :lady_beetle: needs-investigation :mag:

microsoft/MIDI#968 · 12 comments · 1 assignee · Opened Apr 4, 2026
[BUG]: Windows 11 KB5077181 (26200.7840) causes Hotone/Valeton USB MIDI device disconnect loop during firmware update, preventing transfer and leaving device stuck in bootloader mode Open

app-compat 😵 bug :lady_beetle:

microsoft/MIDI#944 · 47 comments · 1 assignee · Opened Mar 23, 2026
[BUG]: Ableton Live 12.3.6 doesn't recognize Ableton Push 3 midi ports Open

bug :lady_beetle: needs-investigation :mag:

microsoft/MIDI#941 · 9 comments · 1 assignee · Opened Mar 19, 2026
[BUG]: Possible Elektron Overbridge interference with Montage M in MIDI 1.0 mode with Yamaha Steinberg driver Open

needs-investigation :mag:

microsoft/MIDI#923 · 1 assignee · Opened Mar 8, 2026
[BUG]: Multiple watcher events fired when adding a new basic loopback Open

area-transports :bus: needs-investigation :mag:

microsoft/MIDI#917 · 1 comment · 1 assignee · Opened Mar 6, 2026
[Feature]Add at least Windows XP style Midi Mapper functionality to be able to define default Midi Out port Open

feature request :bulb:

microsoft/MIDI#916 · 22 comments · 15 reactions · 1 assignee · Opened Mar 6, 2026
[BUG]: WinRT MIDI 1.0 MidiInPort silently dead after USB replug on 25H2 Open

area-service-or-api :desktop_computer: area-windows-internal :window: bug :lady_beetle:

microsoft/MIDI#906 · 2 comments · 1 reaction · 2 assignees · Opened Mar 3, 2026
[BUG]: `midiOutOpen` takes additional apx 10ms with WMS enabled Open

area-winmm bug :lady_beetle:

microsoft/MIDI#892 · 1 comment · 1 assignee · Opened Feb 28, 2026
[BUG]: USBMidi2 driver doesn't support USB devices with invalid iSerialNumber Open

area-usb-driver :computer: bug :lady_beetle:

microsoft/MIDI#877 · 7 comments · 1 assignee · Opened Feb 22, 2026
[TODO]: Create short tutorial videos showing Windows MIDI Services features Open

area-documentation :page_facing_up:

microsoft/MIDI#874 · 1 assignee · Opened Feb 21, 2026
[TODO]: MIDI Loopback Setup app does not check for globally unique names when adding loopbacks Open

area-user-tools :gear:

microsoft/MIDI#864 · 1 comment · 1 assignee · Opened Feb 19, 2026
[BUG]: Realtime/Clock to device sends seemingly random things Open

bug :lady_beetle: needs-investigation :mag:

microsoft/MIDI#859 · 8 comments · 1 assignee · Opened Feb 15, 2026
[TODO]: Timing of MIDI 2.0 discovery and protocol negotiation can cause confusion Open

area-service-or-api :desktop_computer: area-transports :bus: area-user-tools :gear:

microsoft/MIDI#837 · 2 comments · 1 assignee · Opened Feb 1, 2026
Removal of MIDI 2.0 device during discovery and protocol negotiation can result in a hang/crash Open

area-service-or-api :desktop_computer:

microsoft/MIDI#819 · 2 comments · 2 assignees · Opened Jan 13, 2026
[TODO] Implement a way to make a MIDI 2 device unavailable to clients until all discovery has been completed Open

area-service-or-api :desktop_computer: optimization :comet: todo 🗃️

microsoft/MIDI#818 · 1 assignee · Opened Jan 9, 2026
[TODO] Support Network MIDI 2.0 Authentication modes Open

area-network-midi2 🛜 area-transports :bus: area-user-tools :gear:

microsoft/MIDI#733 · 1 assignee · Opened Aug 25, 2025
[BUG]: Surprise removal / connection cleanup tracking parent Open

area-service-or-api :desktop_computer: area-winmm

microsoft/MIDI#706 · 2 assignees · Opened Jul 25, 2025
[BUG]: SDK reports old endpoints after PC has resumed from sleep Open

bug :lady_beetle: needs-investigation :mag:

microsoft/MIDI#585 · 2 comments · 1 reaction · 2 assignees · Opened Mar 4, 2025
[BUG] WinMM app stops receiving messages when open/close connection multiple times across several apps Open

bug :lady_beetle: needs-investigation :mag:

microsoft/MIDI#564 · 13 comments · 2 assignees · Opened Feb 28, 2025
Implement generation of and handling of Jitter Reduction Timestamps Open

area-sdk :wrench: area-service-or-api :desktop_computer: feature request :bulb: needs-investigation :mag: wontfix

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/MIDI#69 · 3 comments · Opened Jun 19, 2023

microsoft/MIDI

Get new issues in your inbox