Thanks for your to my previous topic regarding the sound card

I am runing nuendo3 and Yamaha 01v digital mixer for my studio. Both connected using WaveCenter/PCI Card for the PC and Yamaha MY8-AT Card installed to the mixer. I've loaded some wave to Nuendo and I can use the Yamaha 01v with no problem, but the real problem is that I can't get the audio transfer from Yamaha 01v to nuendo.
I've got music and beats on my MPC4000 and Keyboard both connected to my Mixer. that I need to send to the PC via Yamaha 01V to process hem through nuendo but it seems not to work

My second help question is how do I connect all the gears together, Here's the list of the hardware that i curremtly have:

*Triton Rack
*Peavey compressor
*MOTU midi-timepiece (USB not included. It comes with serial port cable type)
*Roland 24-Bit reverb Effect processor
*Roland GS-6 Guitar Sound System
*Lexicon MX200 effect processor
*2 31 Band graphic EQ
*61 Key Keyboard
*MPC 4000
*Mic Pre
*DVD and CD Recorder

THANX FOR YOUR HELP ONCE AGAIN