Soundcraft Multi Digital Card for Si Series Mixers Fully compatible with Soundcraft Si series digital mixing consoles such as the Si Expression Provides a full 32 inputs and outputs to and from your computer via USB 2.0 or FireWire ADAT optical ports provide another 8 ins and outs for outboard preamps, recorders, and other gear ADAT connections are available simultaneously with USB or FireWire connectivity Compatible with both Mac and Windows PCs