Vic83,
The 9000 Pro does have overdub, but it can only be used under style recording.. If you just use the standard 16 tracks without a style you don't have the option of overdub and loop recording.. If I remember correctly I think someone said a while back you could at least merge tracks on the 9000's..

Squeak
_________________________
GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.