Fw Interface With Old G4 Options

[pashalifi]

I have an old G4 400MHz, running old Logic (4.8), using Edirol USB audio interface - I'm upgrading to Logic Pro7 and Panther, I want to upgrade the I/F to allow at least 4 inputs, so I was thinking of the Edirol FA101 or the M-Audio FW 1814. I checked their minimum requirements and it says 700Mhz minimum... does anyone have experience of using a firewire audio I/F with an older 400Mhz G4? Will I be unable to use any Firewire I/F with my old Mac? Will I need to upgrade the Mac before I can get 4 or 6 inputs?

hope someone can help me?