Set List Maker 3.4 adds the ability to send separate audio signals (either an attached recording, tempo click sound or starting pitch) to separate output ports, so you can send a stereo backing track to your PA and send tempo or pitch sounds to your headphones or in-ear monitors. (Playing two recordings simultaneously is not yet supported.)
This functionality requires a USB audio interface connected to your iOS device via the iPad Camera Connection Kit. I'm using a Roland Duo-Capture mk2:
http://www.rolandus.com/products/details/1263
While researching what device to buy, I found more compatible interfaces listed here, but these were more than I needed for a simple dual-stereo-ouput setup:
http://music.tutsplus.com/articles/ipad-audio-devices-interfaces--audio-16640
If you've tested a product that works or doesn't work with your iPad, please post your results here.
Like you, I was hoping to find a simple and affordable, USB-powered audio dongle with a short lightning cable and a 3.5mm socket, for a few tens of $/£. It seems to be a tall order. An adaptor simply uses the headphone signal.
I guess this one does it...
https://www.amazon.co.uk/dp/B09YLVW9MQ/ref=sspa_dk_detail_6?psc=1&pd_rd_i=B09YLVW9MQ&pd_rd_w=UyPnT&content-id=amzn1.sym.15c0cc83-c6c5-4d44-aa3d-0de17a9f3682&pf_rd_p=15c0cc83-c6c5-4d44-aa3d-0de17a9f3682&pf_rd_r=WT12SG957NNFV7BBERWY&pd_rd_wg=v3QRT&pd_rd_r=a62dccb4-3f9f-4581-b7ef-3ae4af243644&s=electronics&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWw (https://www.amazon.co.uk/dp/B09YLVW9MQ/ref=sspa_dk_detail_6?psc=1&pd_rd_i=B09YLVW9MQ&pd_rd_w=UyPnT&content-id=amzn1.sym.15c0cc83-c6c5-4d44-aa3d-0de17a9f3682&pf_rd_p=15c0cc83-c6c5-4d44-aa3d-0de17a9f3682&pf_rd_r=WT12SG957NNFV7BBERWY&pd_rd_wg=v3QRT&pd_rd_r=a62dccb4-3f9f-4581-b7ef-3ae4af243644&s=electronics&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWw)
Have I missed one, anybody?
Don't know if this will help
I use this instead of a camera kit and it does everything I need.
Kanex iAdapt 6-in-1 Multiport USB Type-C Docking Station for 11" & 12.9" iPad Pro.
Key Features
USB 3.1 Gen 1 Type-C Port
USB 3.1 Gen 1 Type-A Port
HDMI Port
3.5mm Audio Jack
UHS-I SDXC & microSDXC Card Slots
Supports Device Charging up to 60W
Supports 2K at 60 Hz Video Output
Supports HDCP 2.2 and 1.4
Integrated USB Type-C Cable
https://www.bhphotovideo.com/c/product/1498955-REG/kanex_premium_usb_c_hub_for.html
Thanks Kiff. Not sure if that gives ADC audio or just a repeat of the headphone but mine is a lightning connector anyway.