I’ve been middle clicking for ages and getting nothing then found this video: [Ardour] - MIDI Learn - YouTube where they use CTRL - and now it works for me.
This is Ardour 6.9 btw
Thanks - if the docs need updating I can do that and create a pull request
All the best
MIDI-learn has always been <Ctrl>+middle-click, as far as I can remember.
This is what that manual web page looks like for me (in Firefox):
The HTML source looks like “<kbd class=“mod1 mouse”>Middle</kbd>-click”, and the CSS is supposed to define the “kbd” and “mod1” styles appropriately. Obviously that’s failed for you: which browser/OS are you using?