You could use these controls
Holding a key down will send you to that lane for the time it pressed.
Pressing nothing will send you to the center.
A = Left gutter
S = Left lane
D = Right lane
F = Right Gutter
or use the numbers keys which don't require being held down
~ = L Gutter
1 = L lane
2 = Center
3 = Right lane
4 = R Gutter
comma and period are used to scoop[comma] and drop[period] or, well, I guess that's just whatever the Left and Right mouse buttons are
.