Re: Mild Upgrade
USB has more CPU overhead then firewire as I recall.. There is a bit of trade off, I've had good luck with my firewire interface too (ProFire 2626), but USB realistically has more of a future than firewire.
USB 2.0 has plenty of capacity for the 18i20's IO.
As Sardi mentioned, driver support is the key. Both to support your older Mac, and for new OS's that come out should you upgrade in the future.
Joel
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Jam Space:
HP Elite 6300 / Core i5 3770 / 24GB RAM / Win 11 Pro
Pro Tools HD / Focusrite 18i20 + M-Audio ProFire 2626
Home:
Asus B450 Pro4 / Ryzen 5 2600 / 32GB RAM / Win 11 Pro
Pro Tools HD / Focusrite 18i20 + M-Audio ProFire 2626
Rig:
Eleven Rack / ART SLA1 / Two 2x10 Passive Monitors / FCB1010 w/ EurekaPROM
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