Issues

• [BUG]: Saving a custom port name does not save/merge with previous custom names on reboot

  bug 🐞
  Bug

  microsoft/MIDI#1269 · Filter by author bencalnan opened on Oct 11, 2026
  1

  

• [BUG]: WinMM output stays broken in a process after a USB MIDI disconnects and then reconnects during a large SysEx send

  bug 🐞fixed-windows-release-q4-2026-q1-2027
  Bug

  microsoft/MIDI#1267 · Filter by author insolace opened on Oct 10, 2026
  2

  

• [BUG]: In-box General MIDI/DLS synthesizer: envelope, drum pan, and reverb rendering issues

  bug 🐞fixed-awaiting-public-release 🕙
  Bug

  microsoft/MIDI#1260 · Filter by author acerbt opened on Oct 5, 2026
  2

  

• [BUG]: Default size of the in-box apps is too small

  fixed-awaiting-public-release 🕙
  Bug

  microsoft/MIDI#1259 · Filter by author Psychlist1972 opened on Oct 5, 2026
  

• [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
  

• [TODO]: Add button (elevated) to Network MIDI Setup to enable midisrv through the firewall

  fixed-awaiting-public-release 🕙
  Task

  microsoft/MIDI#1257 · Filter by author Psychlist1972 opened on Oct 4, 2026
  

• [BUG]: Windows MIDI Patchbay - checking "start minimized" has no effect

  fixed-awaiting-public-release 🕙
  Bug

  microsoft/MIDI#1256 · Filter by author Psychlist1972 opened on Oct 4, 2026
  

• [Feature]: Enable per-note per-channel combination filters / mappers

  fixed-awaiting-public-release 🕙
  Feature

  microsoft/MIDI#1255 · Filter by author Psychlist1972 opened on Oct 4, 2026
  1

  

• [TODO]: Add pruning of messages to speed throttling algorithms

  Task

  microsoft/MIDI#1254 · Filter by author Psychlist1972 opened on Oct 4, 2026
  

• [BUG]: Preview 10 MIDI Network setup doesn't show the "automatic throttling" option in all locations

  Bug

  microsoft/MIDI#1253 · Filter by author Psychlist1972 opened on Oct 4, 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
  

• [Feature] USBMIDI2 driver: support legacy Yamaha USB-MIDI devices that declare vendor-specific class 0xFF (tested with UX96 and MU1000)

  feature request 💡needs-investigation 🔍under consideration 🤔
  microsoft/MIDI#1234 · Filter by author daifuku-labs opened on Sep 24, 2026
  1

  

• [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
  7

  

• [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]: Using incorrect association id in a remove op for basic loopback causes service instability

  area-transports 🚌needs-investigation 🔍
  Bug

  microsoft/MIDI#1081 · Filter by author Psychlist1972 opened on Jul 29, 2026
  

• [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