Thank you very much for your feedback. I very much understand where you're coming from, and I think you make a very good point outlining that in particular musicians are usually quite short on cash and can't afford the latest and greatest iPhone.

We need at least iOS 14 for the stereo recording functionality. Even then, not all devices that support iOS 14 also support stereo recording, and we don't even offer the in-app purchase option on those devices that don't support it.

We also make heavy use of CoreML, for which we require at least iOS 13. So in theory, we could go one version lower, but since all devices that support iOS 13 also support 14 and 15, we will likely increase the minimum version to iOS 15 once it has reached significant adoption, because of the improvements to CoreML iOS 15 ships with.

I know it's not the answer you wanted. I hope you understand that this choice wasn't made out of ignorance, but simply due to hard technical limitations.