What cables needed to connect from Korg LP 380 to iPhone12 Pro & 6th gen iPad

See the Korg Website: https://www.korg.com/us/products/digitalpianos/lp_380/usb.php

You can use a USB cable* to connect this instrument's USB port to your smartphone, tablet, or computer, and use the LP-380U as a MIDI keyboard to play an external sound module. Your performance on the LP-380U can be recorded as music data on your smartphone, and sound from your smartphone can be heard through the speakers of the LP-380U. 

*USB cable sold separately for connection to your PC, and a USB cable + Lightning-USB camera adaptor or USB B to C cable (both sold separately) for connection to your iPhone or iPad.

link-> Lightning to USB Camera Adapter - Apple

Hey Bikkles,

Thanks for posting your question in Apple Support Communities!

You may need to contact the keyboard's manufacturer for assistance with what accessories you can purchase for it.

Best Wishes.