Hey ! So there’s two ways to do that :
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you could have any controller with an edit mode mapped to the Digitakt respective CCs, mapped to whichever midi channel your auto-channel is set up on the Digitakt, and switch tracks on the Digitakt.
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you could have a controller that can handle different pages or parameters set, with each track in your Digitakt mapped to a different channel, and each pages of the controller mapped with the same CCs but different midi channel.
Pretty much depend on which method you want to use, and how many controls you want to handle !
Either way look for something that has a direct midi output option if you want to avoid a usb to midi converter, faderfox are the most flexible but expensive options, the latest novation launch control is pretty great.
This topic keeps popping up also, loads of options: