There are certainly benefits to using a USB audio interface, but it isn't strictly necessary for your use case.

Which model of digital piano do you have? Integrated audio interfaces aren't uncommon nowadays.

There are also adapters like this one, which allow you to charge the iPad, send MIDI from the digital piano to the iPad via USB, and send audio out to headphones via the 3.5mm jack on the adapter itself:

https://www.amazon.com/Adapter-Headphon...0CC5QJKXP/

That link is to an adapter for iPads with a Lightning port.  Would be different if OP's iPad is one of the models that has USB-C instead of Lightning.  So maybe OP can also clarify what iPad they have.

Which model of digital piano do you have? Integrated audio interfaces aren't uncommon nowadays.

There are also adapters like this one, which allow you to charge the iPad, send MIDI from the digital piano to the iPad via USB, and send audio out to headphones via the 3.5mm jack on the adapter itself:

https://www.amazon.com/Adapter-Headphon...0CC5QJKXP/

Hello,

I'd ike to connect a digital piano with iPad via USB cable and I want to listen to the audio through headphones. I understand that I must connect a dual-port hub to the iPad:

1) A USB port would be for MIDI data coming from the piano's USB to host.

2) The other USB port would be to connect a USB to headphone jack adapter.

Am I wrong or is there an easier way to do it?

On the other hand, is the audio coming out of the iPad good enough to be listened to with headphones?

Thanks in advance and best regards,

Raül

i use an older iPad with a headphone port. The audio playing pianoteq with headphones straight out of the iPad is fine for me - different headphones will give different quality and i am not a classical player expecting concert-hall audio quality while playing/practicing so ymmv

i actually listen thru the iPad speakers more often than through headphones (which is completely fine for my purposes) but this is not my main playing/practice set up

i understand that when i upgrade to a new model iPad, the simplest way to set it up is the way you have described. if you want to output to decent speakers for gigging then you need an audio interface into your USB hub - there's another thread on that

I'd ike to connect a digital piano with iPad via USB cable and I want to listen to the audio through headphones. I understand that I must connect a dual-port hub to the iPad:

1) A USB port would be for MIDI data coming from the piano's USB to host.

2) The other USB port would be to connect a USB to headphone jack adapter.

Am I wrong or is there an easier way to do it?

On the other hand, is the audio coming out of the iPad good enough to be listened to with headphones?

Thanks in advance and best regards,

Raül