I actually don’t care about correcting audio, I wouldn’t expect an iPad app to do that. I want to be able to record a guide audio part and then tap out the tempo to go with it to create my tempo track. If it’s a project that already has audio and you attempt a tempo change it should warn you, ask you to create a snapshot and then perform the change. I can then re-record the audio that no longer fits if need be.
I use Cubasis as a scratch pad so I’m quite happy to be missing a few features. Once I’m happy I’ll pass it off to my desktop machine to continue with. Being able to enter basic info like tempo and key changes should be a given. As i said, don’t worry about implementing time stretching we just want a basic tempo editor. If you can implement automation then this should be a breeze for you.
The other odd thing that I was kind of expecting is a notepad for each channel. Just to keep notes on things like guitar tunings or lyrics, it’s a simple but hugely useful feature.