Not all of us are using the newest i-phone with the fastest processor and uber amounts of RAM.
If you can't make a stable version that runs across all the i-platforms, then perhaps you need to make a less bloated version for the touch.1. When I change a track or skip, many times the title and album art will hang on what was playing two songs prior.sometimes the app crashes altogether.
When I choose to add a song to a playlist, it hangs and sits there almost like it's not adding the song.
Although i OS 8 is not the latest i OS version, you still need to upgrade to i OS 8 and i OS 9 firstly before upgrading to the latest i OS 10.
And installing i OS 8 on i Phone i Pad is not difficult, all you need to do is following the device or i Tunes screen prompts, but it is necessary to follow a detailed tutorial so that you can make a smooth upgrade.
Update: Apple has released i OS 9.3.2 for bug fixes and security improvements.