Can't patch Digitone into Ableton (audio via USB)

hi all, I’m sure this is a well-worn question but I’m stumped. What’s more it’s working on my laptop, but not my tower.

I just want to patch my Digitone via USB to an audio track in Ableton Live Lite 10. It works on my laptop (I press play on the Digitone and the meters fire), but when I do the exact same thing on my tower, nothing. Here’s a screenshot. Any ideas?

Just to add - the test tone works, I can hear it through my speakers. This screen shot is while the Digitone is playing, and I’ll note nothing on the meters.
I should also add my laptop has Overbridge installed and the tower doesn’t. But I’m not using Overbridge on either so I don’t think it is relevant here.