In theory, if you plug in a mouse it should disable the touchpad thing.
Although if that's not true there is a setting somewhere to toggle that behaviour.
This looks like someone has the same problem... some versions of OS X don't allow you to disable the touchpad, but upgrading would.
http://www.logicprohelp.com/forum/viewtopic.php?f=10&t=82097
@Velocio started
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In theory, if you plug in a mouse it should disable the touchpad thing.
Although if that's not true there is a setting somewhere to toggle that behaviour.
This looks like someone has the same problem... some versions of OS X don't allow you to disable the touchpad, but upgrading would.
http://www.logicprohelp.com/forum/viewtopic.php?f=10&t=82097