$10 - Apple Headphone Jack Adapter (it's actually a full blown DAC)
https://www.apple.com/shop/product/MW2Q...ck-adapter

$200 - Focusrite Scarlett 2i2 G4 - will do the job, but you'll need a powered hub to charge the iPad ("dongle hell")
https://focusrite.com/products/scarlett-2i2

$400 iConnectivity AUDIO4c - imho the best interface for the iPad
will charge the iPad, use iPad + Desktop/Laptop/iPhone together, USB-MIDI, loopback...
https://www.iconnectivity.com/audio4c

and many more...

Youtube: HOW TO choose an Audio Interface – The Ultimate Guide

I’ve always played Pianoteq on my PC at home. A friend retired her business and gifted me a free 2022 I-Pad Pro. This proved my first ever experience with IOS – I humbly had to watch a YouTube video just to learn basic functions like closing I-Pad apps and powering it down. I loaded Pianoteq from the Appstore and registered it into my main Pianoteq account – eh voila;  it works perfectly.

I cable connect a MIDI controller keyboard to the single USB -C jack on the I-Pad. Wow -- I’ve got Pianoteq to go. So wonderful. Now we’ve got a Pianoteq car camping option with a lightweight 49 key MIDI controller + I-Pad tucked into our vehicle.

Another friend asked me to bring “my rig” over and plug into his PA system to jam with his band. I have no idea how;  or whether I could do this with an I-Pad.  Any thoughts please? 

Thanks _BM