I'm trying to re-create what I can do with Logitech MX mice with the magnetic scroll wheel where I can flick the wheel and it will continue to rotate until I put my finger on it again to stop the rotation. With the Logitech mice, one flick with take me from minimum to maximum quickly and smoothly. When I use the Volume Up or Down action with a scroll up or down trigger, it is slow and the action stops almost as soon as I lift my finger from the mouse. The repeat functionality, if I'm using it correctly, doesn't seem to make much of a difference and nothing I do seems to speed things up. Thank you.
If you need to go from min to max as fast as possible you can use the "Set System Volume to" action.
Another option is to use something like the following which will allow to gradually increase the volume with a single flick, however this won't stop if you lift your finger(s):
Maybe there's a way to workaround this with "if" condition or with "Wait For Conditions to Become True"
I know that this is not what exactly you are looking for, but hopefully it is helpful.