I have a couple of effects units that I use as external effects in Cubase SX. They work wonderfully well but at the moment I'm using the analog inputs and outputs. Ideally I would like to interface them digitally. I have a MOTU 2408 MkIII with a spare ADAT port, is there a cheap'ish ADAT to 4 SPDIF converter anyone knows of? Basically a unit with an ADAT in and out and 4 SPDIF in's and out's so I could connect up to 4 effects units via the SPDIF's to the ADAT port.