Fostex volume controller

Performance & Techniques Music Production
1

Volume controller connection?

I like the look of the Fostex volume controller. This one

https://www.musicmatter.co.uk/fostex-pc1e-white?origin=google-product-ads&gclid=Cj0KEQiAiO-kBRCNxtaJp4-En6sBEiQAnkvW3xzVjWWBGYpK4xIxhzElL3VwikhwSIsMPCdGlr9g3dsaAoSC8P8HAQ

But was wondering how its connected up to an audio interface?