I am wondering if the gcode command G92 Ennn does anything when using a pneumatic 3D printer. My understanding is that it supplies the filament when fed mechanically, but since my material is pushed through using a preset air pressure (not controlled through the gocode). I am wondering if the command line G29 E0 that is used to reset the current filament position before each new layer actually plays any role.

I am using Slic3r 1.3.0 and Repetier-Host V2.0.5 and Marlin firmware

Thanks for any help provided.