so ive got a mesa triple reco and a pod hd 500

now what i want to do is connect my pod and just use the fx from it not amp sim,

ive tried using the 4cm:

     Guitar ==> HD Input

     HD FX Send ==> Amp Input

     Amp FX Send  ==> HD FX Return Left

     HD 1/4" Output Left ==> Amp FX Return

the problem is when i connect it like this i can only use the volume control i cant change the tone on the amp which makes me thing that its only using the mesa as a power amp or something.

id like to connect the hd500 so i can use the mesa distorion channel and add overdrive pedals ect...

any ideas??