Q-Link not working on some channels (Cubase 14.0.41) – reliable workaround
Symptoms:
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Q-Link on, multiple channels selected
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Channels 1–14 faders move together

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Channels 43–59 only move the touched fader

Fix:
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Duplicate a working audio channel (where Q-Link works)
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Drag it next to the problematic channels
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Q-Link now works for that group
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Delete the duplicated channel
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Save — Q-Link continues working, even in earlier saved versions
Theoretical explanation:
This forces Cubase to rebuild the MixConsole internal state, restoring Q-Link functionality for channels that were previously “desynced.”
This reliably restores Q-Link without rebuilding tracks or resetting preferences.
Your milage may vary.