Fair points. But I just wanted to let you know that Looptical is _not_ another Looper pedal app. The name comes from the idea of a new method of composing by recording sections of music (which it terms "loops") and then combining those into longer sections, overdubbing, and so on. I can't fully explain this here, unfortunately, but the Looptical manual is available on this site that has more. This lets you go from a few musical riffs and ideas into a full song without having to drag-select copy-paste tiny boxes in a piano roll, which I've always found impractical on an iPad and impossible on an iPhone. Aside from this novel approach to the traditional piano roll, in all other respects Looptical is a sequencer, DAW, and sample-based instrument soundbank.
Looptical would be better described as: "Pianist Pro with multiple tracks and instruments, insert effects on each track, Audiobus and IAA compatibility, better editing options, and so on and so on".
Probably I shouldn't have called it "Looptical" because of the assumptions people seem to now make about the word "Loop", but at the time I thought I was being clever.
For your specific use case, you could set up Looptical to output to Audiobus to Looper, and then play any of the many preset instruments, or even create your own by importing one or more samples. You could add up to 5 insert effects to the track (instrument) you are playing live, and even control every parameter of each of those effect with MIDI controllers. (Eg. a knob on your MIDI keyboard to control filter, and another to control delay feedback).
I'm pretty sure that the piano from Pianist Pro is included in Looptical as a preset, but if not then it would not actually take you that long to record a few notes (I think Pianist Pro has one sample every 4 or 5 keys, so we're not talking 88 notes), import that Wav into Looptical, cut out each note and assign to the key of a new instrument. And of course if you get bored with the Pianist Pro piano then you can do the same thing to sample any other piano or instrument of your choosing. There are even kind Looptical users who have created their own piano instruments for you and have posted links to them from our forum.
Alternatively, putting aside Looper for a small moment, you could record a drum-beat in Looptical, expand it to 36 bars or something (probably overdubbing and adding fills and so on), add a killer bass part, then record your piano part over top using one of the Looptical pianos. Then route your guitar through a guitar effect app -> AudioBus -> Looptical and record that as an audio track over the top. You might even want to add the odd additional Looptical effect to your track. And then add your vocals in the same way. Add a global reverb and compression effect, and then mix your track by recording changes in automation to just about every parameter. Finally export your track as an M4a and email it to someone.
This video gives you a general idea:
I understand the old argument that developers want to chase profit (which is another way of saying "eat"), and customers want endless free updates to four year old apps that only cost them the price of a cup of coffee in the first place. There unfortunately isn't a solution to this, and by even trying to respond to your statement I've probably put your back up. Sorry. However, in this _particular_ case, I have good reason for spending more time on Looptical than Pianist Pro. Looptical basically _is_ the best parts of Pianist Pro, with a huge amount more stuff added.