Hi. I explained how to scroll in Live horizontally and vertically using the right alt key plus the arrow keys. This works in any app not just Live.
I've updated the .xml file I made for this, to include a left handed version:
modifier is the left control key
QA = Up/Down
If you want to do a lot of scrolling and not much else for a while, eg reading Live's manual, activate sticky keys so you don't need to keep the modifier held down. You can activate the left and right hand versions simultaneously.
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Tutorial:Easy ways to control Live 9