What's the best way to set up the following rack mounted gear (in order from guitar to unit 1 through to unit 4):

Mesa Boogie Rectifier Recording Preamp
M-Audio Delta 1010 (rack mounted hardware for the soundcard)
Samson Power Amp (to speakers)
Yamaha SPX1000 (digital effects rack)

I assume the sound card (Delta 1010) is the last piece of hardware which sends the output to the Power Amp and the studio monitors.