It’s hard to know where to begin tbh… and it probably depends on what you want to connect to it.

You have four (stereo) channels, each with its own looper, eq/filter section and multi-fx section… so the possibilities of these are vast straight away.
But, the inputs are routable, so say so you have Digitakt plugged into Ch 1 of the DB4, you can get a pattern going and loop it, then a flick of a switch routes the DT to Ch 2 where you can do something else… get that looping, move to Ch 3 with it, etc.
Not forgetting it’s a DJ mixer, so you can cue mix your next parts away from the main mix and bring it in how you want to.

I’d watch some YouTube videos on it to get an idea… it’ll seem daunting without one in front of you, but, honestly, it’s really intuitive when you get your hands on it.

The main issue with the DB4 to be aware of though is that it won’t run after a certain MacOS (I think it’s Catalina), so if you’re looking to use it’s USB audio side, bare that in mind. But, just as a standalone mixer, filter bank, 4x fx processor, it’s worth it.

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