yes you can I use the Akai MPX8 plugged to one of the USB in the back of the 5000 you can also link both SC5000’s together so you only use one cable to your laptop.
You can use the extra USB ports on the rear of the SC5000 to link together or daisy chain SC5000’s together, avoiding a USB hub, but only with 2 or 3 physical decks.
Daisy chaining setup examples are below.
2 DECKS (SC5000 1 used as powered hub)
SC5000 1 to PC/Mac via USB 3.0 Cable
X1800 to PC/Mac via USB 2.0 Cable
SC5000 2 to SC5000 1 USB 2/3 via USB 3.0 Cable
3 DECKS (SC5000 1 used as powered hub)
SC5000 1 to PC/Mac via USB 3.0 Cable
X1800 to PC/Mac via USB 2.0 Cable
SC5000 2 to SC5000 1 USB 2 via USB 3.0 Cable
SC5000 3 to SC5000 1 USB 3 via USB 3.0 Cable
4 DECKS (Use an external powered hub to minimize the number of hubs used)
Yup this is what I tried today and was unaware of.
This was what I was doing before with the two decks.
I tried to push it further by connecting my Pioneer S9 to the decks just for the sake of dj science [I know USB Audio interfaces have to be plugged directly to computer USB] and it didn’t work.
Time for Denon to update the user manual of the firmware as only “USB Storage Devices” was mentioned in it and I did read the manual a few times.