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I wasn't sure where to post this idea, but here goes... I just saw this today. An open source app (midi2lr) that lets you control LR via a midi controller. The obvious benefits are that you can have a hardware or virtual (think IPad based) device with dedicated analog controls (sliders, buttons, toggles, etc.) custom tailored to interact with AP. Take a look here to see what I mean. http://petapixel.com/2015/08/12/midi2lr-an-open-source-app-that-lets-you-use-any-midi-controller-in-lightroom/ (video at bottom, 1'41") What a great interface for interacting with a photo editor! There seems to be 3 components needed: 1. AP API (possibly via the Extension specification?) 2. MIDI2LR (fork open source project to create MIDI2AP) 3. Midi controller. These range in price from $ - $$$. Is their a high-level API for AP to allow for this type of input? Maybe via an Extension? Not sure as I haven't been able to find any documentation around this specification. Here is another example showing LR being controlled with an inexpensive midi controller. https://www.youtube.com/watch?v=dRwkDZguAQg (16'03") Thanks for your time. Thoughts?

I notice it is possible to have the size of the brush controlled by pressure, and the opacity controlled by velocity with a brush in the Pixel Persona in Affinity Designer. However, I cannot seem to do this with the Vector Brush tool. Am I missing something? In the Vector Brush options, it will allow me to change from pressure to velocity but it changes for both opacity and size.