In Final Cut Pro, you have the option to hold down keys to act as modifier keys. For example, holding down R for the range tool will activate the tool until it is released. A single tap will turn the tool on.
I'd like to map this to one of my mouse buttons (Naga Pro with keyboard buttons mapped to it).
How do I get bbt to recognize that a key is being held down and to transfer that to the action?
And how do you prevent R from being typed? How is it decided whether "a single tap" activate the function or R is typed?
I don't know Final Cut Pro. But if it works in such a way that the cursor has to be in a certain field, then BTT probably can do that too.
you'd need to configure two separate triggers for your mouse button. One for mouse-down and one for mouse-up.
The mouse down trigger would trigger the R key but only send the "key down" event. The mouse up trigger would also trigger the R key but only send the "key up" event:
Just as further education for me, is the R typed or not?
I think Final Cut Pro has lots of interfaces that don’t accept text, thus it’s not really being typed because there are no textfields 
This is to basically hold a specific key while pressing a mouse button. I think you were looking at it from the other side. (I‘m also not sure whether I understood the request correctly)
Mm, if a field doesn't accept text, just pressing R is enough to trigger something. Then the mouse is not necessary, no? 
If I understood correctly he wants to trigger such a function without using the keyboard.
Final Cut already offers this by holding R, but it might be easier for him to hold a mouse button instead.
Thanks Andreas,
I gave your suggestion a try. Unfortunately final cut doesn't recognize the key as being held down - just as a tap.
I did use your method to set it to switch back to the default tool on mouse up, which is working about 50% of the time.
Here's my file.. not sure if I can improve it.
fcp range tool.bttpreset (7.3 KB)
For context, in final cut you hold down the R button + left click and drag to select a range of a clip. Trying to move this all to one button on my mouse.
I just came here, to tell you my whole evening. 
It seems, that FCP is the Problem.
I had a long conversation with ChatGPT.
And after 2 hours we gave up.
Final cut doesn´t accept synthetic “LMB down”
I tried it all evening with the Logitech G Hub Software and now with BTT with my new Logitech G502x Mouse.
I can send all commands and Mouseclicks.
But no Mouse holds.
Really really tricky.
I cannot understand why, but it seems a FCP thing.
That's interesting, I think that should be doable. I'll download the FCP trial version tomorrow and give it a try.
Oh wow, Thank you 1000 times.
I really appreciate this fast feedback and effort 
I tried all evening with the G Hub Software and even LUA Scripts.
The same result i got in BTT
I learned a lot this evening.
But tbh, BTT is waaaay better than G HUB
EDIT:
I got a feedback from StupidRaisins here:
https://www.reddit.com/r/finalcutpro/comments/1qj4jhv/comment/o0xfvn8/?context=1
He´s a big player in the FCP business and i trust him blindly.
So i give up this shortcut in FCP.
But the bindings worked outside from FCP with BTT. So it´s definitly not BTT or G HUBs fault :)
