Just sharing what I was able to do to use a Focusrite Solo (and 2i2) with an Ipad air 2.
First, this cable is needed and worked fine for me: https://www.amazon.com/gp/product/B07HK6HNR1/
Second, you need to select the second channel to use the instrument input. Not obvious where, but you do it in the "tape machine" - you need to tap the "channel 1" on the first main channel - that is where you select 2.
Finally, I connected to the headphone jack of the Scarlett (without the direct monitor).
All works perfectly!
Note that the 2i2 works the same way - but obviously if you connect to its channel 1, you don't need to change channels in the mixer unless you want to.
I suspect I could use the Line Outs to a PA, too, if I wanted to gig with this setup. I have the Stomp I/O, but could gig with the Scarlett nonetheless.
I hope this helps others with similar questions!
