No, both units can’t receive MIDI signals unfortunately. This has been requested by a lot of customers though.
The only way to remotely control the units are via the uRemote app (uTrack24 only) or a footswitch. A footswitch just triggers the next song in a playlist.
For uTrack24 the uRemote app would be usable so you’re able to select a song and play it (even without having a playlist selected).