There's also the iReal Pro App:
https://irealpro.com/Cool!
Maybe, people who want an arranger but don't want to spend a lot of money for one can simply use this. Any thoughts?
XMure sounds good as the backing is a recording of real instruments just like Real Tracks of BIAB. However, it's a double-edged sword; it takes up too much space and just about every style is an in-app purchase with very limited choices. Also, if I remember correctly, it doesn't read chord inversions.
I've had IRealb since its beginning. A great practice tool or can be used even for live performance as long as you use just bass and drums for Jazz stuff. The piano and guitar are not quite there in terms of sound quality. Only if the user can load his/her own sf2 or route it to other synths in the same device. For instance, MIDI Voyager Pro (MIDI/Karaoke for Android & IOS) lets you do that. You can load HQ soundfonts. I wrote to them about writing an arranger app. I don''t think the developer understood what I mean by arranger...
Users of these neat apps can't really complain as they are dirt cheap around $10. Then again, many users are saying that they will be more than willing to pay for better sounds and more features.
By the way, Android must be catching up as far as music/MIDI are concerned. I bought a DX7 emulation app for $1 or $2?). I connected a Korg Microkey to my LG phone. It sounded really good and I didn't feel any latency. Just good to know I can use my phone as a module. A great to-y - I mean a tool.