Connect your DN2 to the iPad with a USB cable. If the iPad has a Lightning port you need the Apple CCK adaptor.
DN2 can act as an audio interface for the iPad if configured. You can send the DN audio through the iPad FX as well.
I use AUM as a plugin host. I’d recommend synths from Waldorf, Moog Music, SugarBytes etc. but there are just too many.
Have a look at the iPad Music Apps thread:
Good for testing the arp or sequencer of an usb powerd keyboard, e.g. Keystep 37 etc.
Only a standard USB B to USB C adaptor was necessary to connect my Keystep to the iPad (2024).