KeyMouse Alpha → the whole left hand device works as a mouse, same for right hand.
KeyMouse Track → with trackball instead.
KeyMouse Alpha on left,
KeyMouse Track on right. 2018.
Note that KeyMouse Alpha has only 3 rows, but
KeyMouse Track has 4.
[image source [ 2018-11-18 https://twitter.com/new_takaratomy_/status/1064086988263837696 ]]
When you have a symmetric keyboard, a lot nerds naturally think the center is the proper place to put the trackball. But that's actually a unnatural position with regards to hands.
The proper position for trackball, is actually near the thumb for a small trackball, or on the side for large trackball.
