Momentary:
Suppose you have a button that generates CC messages with values 0 and 127
There are generally two ways that these are generated.
- Each time you press the button, you get the alternate value. So the first time, you get 127, the next time, 0, the next time 127, etc. Nothing happens when you release the button. That’s called a toggle.
- When you press the button you get 127 and when you release you get 0. That’s called momentary
If you only want GP to respond when you send 127 you have to enable “momentary” - you use this if version (2) above is enabled. If you don’t enable momentary, then GP will only respond to every second button press and hence if you’re using the button to step through rackspaces, the stepping will only happen every second time
If you want GP to respond when you’re in toggle mode (version 1), then you need to disable momentary and regardless of whether your button sends 127 or 0, GP will respond. However, if you have momentary disabled and your button is behaving like version (2), GP will respond when you press the button and then again when you release it - hence if you’re using the button to step through rackspaces, GP will step twice.