Proportional Editing Tablet

Hello there, friends, I´m using a lot of modelling on the projects that I´m working at the moment, and I´m having a problem.
When I activate Proportional Editing, I can´t set the size of the falloff with the tablet because it dont have a scrollwheel, can someone have a solution besides “go and buy a mouse”…?
Can the other keyboard shortcut be used for that like “f” in the sculpt mode…?

Regards…

2.49b it’s page up and page down

Great thank you, own u a mouse…

Yes I own both a mouse and a tablet.

Ehehehe, okie dokie…