microsoft / microsoft/MIDI

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

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@Psychlist1972 is already working on this.

Since Aug 10, 2026.

needs-investigation :mag:
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Description

Thread on Steinberg forums
https://forums.steinberg.net/t/midi-clock-bug-report-windows-11/1038496/11

This is with the Komplete Kontrol MK3 in UMP/MIDI 2.0 mode

usbmidi2-acx driver

Symptom is that Cubase is hanging, but only when sending clock messages. That would seem to indicate the device itself is not responding when sent a clock. Need to verify the message itself is not corrupted.

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