129b59b90f65e958b3a7f688baa434804ddf57c6
The previous idea was to follow Ardour's default \delta val = \delta Y - \delta X In reality it turns out that this is better represented with kLinearMode. VST3 offers the following: * Circular with jump to clicked position * Circular without jump to clicked position * Linear: depending on vertical movement The first is right out. Value changes need to be continuous. The last explicitly mentioning vertical movement was also somewhat discouraging, however most plugins don't take it literally and allow linear X/Y movement.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html
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