Issues

• [BUG] Windows MIDI Patchbay only shows first 8 groups on a device by default

  fixed-awaiting-public-release 🕙
  Bug

  microsoft/MIDI#1314 · Filter by author Psychlist1972 opened on Oct 28, 2026
  1

  

• [BUG]: Zoom R24 with their driver does not shut down properly, and hangs midisrv

  external-caused-break 🛸
  Bug

  microsoft/MIDI#1286 · Filter by author Psychlist1972 opened on Oct 20, 2026
  1

• [BUG] dJay Pro unable to receive data from Hercules DJControl Mix regardless of driver or API mode

  needs-investigation 🔍
  microsoft/MIDI#1281 · Filter by author fcojbb opened on Oct 17, 2026
  17

  

• [BUG]: Dynamically-added teVirtualMIDI port enumerates but is not active if other port on same endpoint is already in use

  fixed-windows-release-h1-2027
  Bug

  microsoft/MIDI#1275 · Filter by author Psychlist1972 opened on Oct 13, 2026
  2

  

• [Feature]: Consider broader UMP support in MIDI Glass for flex messages

  feature request 💡
  Feature

  microsoft/MIDI#1258 · Filter by author Psychlist1972 opened on Oct 5, 2026
  

• [BUG]: Minor CI and Network protocol issues

  bug 🐞feature request 💡
  Bug

  microsoft/MIDI#1249 · Filter by author npxmmc opened on Oct 3, 2026
  10

  

• GetInstalledTransportPlugins reports the transports enabled in the registry now, not the ones midisrv loaded

  Bug

  microsoft/MIDI#1243 · Filter by author Psychlist1972 opened on Sep 28, 2026
  

• [BUG]: MIDI input lag after hibernating

  needs-investigation 🔍
  Bug

  microsoft/MIDI#1233 · Filter by author Psychlist1972 opened on Sep 24, 2026
  

• [BUG]: Alesis Nitro Ultimate XL not working with Windows MIDI 1.0 or 2.0

  bug 🐞needs-investigation 🔍
  Bug

  microsoft/MIDI#1218 · Filter by author themadmusician1106 opened on Sep 19, 2026
  8

  

• [BUG]: Opening a MIDI connection raises the client application's process priority class to HIGH (MidiXProc MMCSS fallback)

  area-service-or-api 🖥️
  Bug

  microsoft/MIDI#1197 · Filter by author Psychlist1972 opened on Sep 12, 2026
  1

• [BUG]: A stalled driver wedges WinMM MIDI open/close machine-wide — unbounded RPC and global locks give it unlimited blast radius

  needs-investigation 🔍
  microsoft/MIDI#1195 · Filter by author Psychlist1972 opened on Sep 11, 2026
  4

  

• [TODO]: Service cannot be stopped while a client holds a connection (management app polling, and likely WinMM ports)

  area-service-or-api 🖥️needs-investigation 🔍
  Task

  microsoft/MIDI#1174 · Filter by author Psychlist1972 opened on Sep 6, 2026
  1

  

• [Tracking] BLE MIDI 1.0 Device Compatibility tracking

  Task

  microsoft/MIDI#1173 · Filter by author Psychlist1972 opened on Sep 6, 2026
  4

  

• [TODO] [Perf] CMidiPorts lock contention stalls the WinMM MIDI send path during device changes

  optimization ☄️todo 🗃️
  Task

  microsoft/MIDI#1169 · Filter by author Psychlist1972 opened on Sep 4, 2026
  

• [BUG]: Session context handles can collide after vector erase and slot reuse

  area-service-or-api 🖥️bug 🐞
  Bug

  microsoft/MIDI#1152 · Filter by author darmolian opened on Aug 31, 2026
  6

  

• [BUG]: Timing clock issue with native UMP device like the Kontrol MK3

  needs-investigation 🔍
  Bug

  microsoft/MIDI#1111 · Filter by author Psychlist1972 opened on Aug 10, 2026
  1

  

• [BUG Parent] In-use MIDI Device Disconnect Parent

  Bug

  microsoft/MIDI#1082 · Filter by author Psychlist1972 opened on Jul 29, 2026
  1

  

• [BUG]: All KS hardware endpoints lost after USB dock swap; in-box usbaudio.sys and USBMidi2.sys both affected #AIgenerated

  microsoft/MIDI#1071 · Filter by author brian-neunaber opened on Jul 27, 2026
  6

• [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))

  bug 🐞needs-investigation 🔍
  Bug

  microsoft/MIDI#1061 · Filter by author sapre2314 opened on Jul 21, 2026
  5

  

• [BUG]: Marshall firmware update fails with certain CODE amps

  area-transports 🚌area-winmmneeds-investigation 🔍
  Bug

  microsoft/MIDI#1044 · Filter by author Psychlist1972 opened on Jul 14, 2026
  1

  

• USB MIDI2-ACX Driver incoming SysEx messages potentially wasted UMP Space with MIDI Baby Gen 4

  area-usb-driver 💻needs-investigation 🔍
  microsoft/MIDI#1042 · Filter by author Psychlist1972 opened on Jul 11, 2026
  

• [BUG]: USB MIDI2-ACX Driver incoming SysEx dump corruption (SysEx Framing issue?) with MIDI Baby Gen4

  area-usb-driver 💻needs-investigation 🔍
  Bug

  microsoft/MIDI#1041 · Filter by author Psychlist1972 opened on Jul 11, 2026
  5

  

• Devices with non-unique / unreadable USB serials (e.g. M-VAVE / MVAVE ) produce wrong endpoint identity — the classic stack degraded more gracefully

  external-caused-break 🛸
  microsoft/MIDI#1039 · Filter by author denisrosset opened on Jul 8, 2026
  13

• [TODO]: Make WinMM and WinRT MIDI 1.0 resilient to midisrv restarts for apps/services with open sessions

  area-windows-internal 🪟area-winmm
  Task

  microsoft/MIDI#1037 · Filter by author Psychlist1972 opened on Jul 3, 2026
  3

  

• [BUG]: Windows update broke InstanceId

  area-windows-internal 🪟bug 🐞
  Bug

  microsoft/MIDI#1020 · Filter by author delchambre opened on May 29, 2026
  8