Pfaff 1425 "air & Efka controller" functions?

[UpState]

Picked up a Pfaff 1425 900/56 with Efka Modular V720 controller and have it listed for sale locallly. Since I don't have the manual right now am I guessing correctly that the external air source is used to lubricate the machine (I see 2 oil bottles) and the purpose of the controller is to control stitch length and speed?

On a side note..I'm very pleased with the Juki LU-563 I picked up ( a lot easier to operate)

Thanks

[Gregg @ Keystone Sewing]

Owners manual for Efka V720?  Here it is; http://www.keysew.com//Webpages/DemoImages/EfkaV720OwnersKeystoneSewing.pdf

[fragged8]

look on the back of the machine is there a pneumatic cylinder ?
it could be a square ali one.
if so the air could be for an air foot lift.