BandHelper has long had multi-route audio output capabilities -- the ability to play Recording 1, Recording 2, Tempo, Starting Pitch and a spoken text field to the headphone jack or specific channels of a USB audio interface. However, this feature is not commonly used and seems to have spotty compatibility with audio interfaces. So here's a list of devices that myself or other users have found to succeed or fail with this feature.
Succeeded
Roland Duo-Capture mk2
Tascam US-16x08
iConnectAUDIO2+
Steinberg UR44
Focusrite Scarlett 4i4
Universal Audio Volt 4
Succeeded but finicky
Behringer UMC404HD
Failed
Behringer UMC1820
Soundcraft Ui24R
I'm happy to test further with any of the failed hardware if any US-based users want to mail me their hardware and I'll mail it back when I'm done. :)
An addendum to explain how the Behringer UMC404HD was encouraged to function, and with Multi-Route Audio capability.
Equipment used:
- iPad 8th generation (iPadOS 16.6)Plugable USB3-HUB7BC 7-port powered USB hub with fast charging and 60W power adapter
- Apple USB 3 to Lightning Camera Adapter
- Plugable USB3-HUB7BC 7-port powered USB hub with fast charging and 60W power adapter
Important notes:
- the interface only functions correctly when on USB bus power; its power adapter could not be used
- everything has to connect through the USB hub.
Steps:
- plug in and power up the USB hub
- connect the Camera Adapter's USB A to the USB B on the hub
- connect the Camera Adapter's lightning port to a USB A port on the hub
- connect the UMC 404HD interface to a USB A port on the hub
- plug the Camera Adapter into the iPad
A further update.
I acquired a new USB hub. A 4+2 port USB3 hub from Venter. It has a beefier power supply; 12V 3A.
Nonetheless, to not tax the USB hub as much, I am now connecting the lightning cable from the camera adapter kit to a separate charger, rather than to the hub.
I haven't tried using phantom power on the UMC404HD, but I have used all four inputs simultaneously. I've connected two channels of an acoustic preamp and two dynamic mic's to the four inputs, and I've not noted any problems. This was done using Loopy Pro, which, although they don't recommend using multiroute audio, has functioned smoothly.
The only thing that's important for the setup to work is to connect/power the UMC404HD last.