Per the previous posts, though, the Pi4B has 2 USB 3 ports. So...you might look at the items already suggested that require USB 3. You'd still need compression for Full HD (1080p). Although the Pi4 has dual USB 3.0 ports (along with dual USB 2.0 ports), all four USB ports are connected to a single ...
I guess now with the Pi 4 this is becoming relevant again. It would be so awesome to use a Raspberry Pi 4 as a capture device and USB3 should be plenty for 1080p at 30 frames, shouldn't it?
One DAW that would be a great candidate for the Raspberry Pi (not just the 3) would be LMMS. Unfortunately it doesn't have audio recording yet, but it's one of the best open source DAWs that I know of! It's also relatively resource friendly.