Steinberg UR24C 2x4 USB Gen 3.1 Audio Interface - Manual (Page 29)

Using with an iOS/iPad OS Device
UR24C Operation Manual 29
10. While singing into the microphone, adjust
the output signal level of the headphones
with the [PHONES] knob on the device.
11. Tap to start the recording.
12. Tap to stop the recording.
13. Tap and slide on the ruler to move the
playback position.
You can also tap to return the beginning of the
recording.
14. Tap to playback the recorded sound.
dspMixFx UR-C (for an iOS/iPadOS device)
From your iOS/iPadOS device, you can conveniently
control built-in DSP mixer functions and DSP effects by
using dspMixFx UR-C for iOS device. For details on
this app, see the Steinberg web site below.
https://www.steinberg.net/