void
4
you want to use the Apple Camera adaptor .
for iPads with Lightning connector:
for older iPads:
This gives you a direct and stable USB MIDI connection.
I dis-recommend 3rd party adaptors. The Apple adaptor is worth the money.
you can also use it to connect class-compliant USB audio interfaces, such as this cheap one:
but iOS supports multi-channel interfaces too.
If you connect a powered USB hub to the iPad, you can e.g. connect an audio interface and the A4, and a keyboard…