iOS 8 Video Editing App That Lets You Hear The Audio While Trimming? I'm interested in making perfectly-looping Vine videos of me playing guitar riffs. I'd like to shoot and edit these videos on my phone (iPhone 5, iOS 8.1), without using a desktop editor. Is there an app that allows you to hear audio while editing?....

Now that you can import videos created elsewhere into Vine, I thought this would be a pretty straightforward thing. However, in order to create a video of this type that loops the way I want it to, I'll need to be able to hear the audio while trimming the clip in order to set the start/end points correctly…and every video editing app I've found silences the audio when you're in editing mode. Right? Am I crazy? 

I've tried: 


iMovie
Splice
uh...a few others I can't remember right now


If anyone knows of a video app that lets you hear audio while you're editing and could tell me about it, I'd be eternally grateful. I feel like I must be missing something here…

Thanks!
There're many great video editing apps in the AppStore. Unfortunately, I'm not allowed to name a specific app according to the StackExchange policy (my previous answer was banned). Some of them play sound while you do video editing (trimming, applying video effects, etc.)

For sure smartphones now have enough computational power to do very complex video editing, they have GPU for even better performance. As a such kind of apps developer I admit that only a tiny fraction of professional desktop video editing software features couldn't be implemented on a smartphone. The major limitation is the screen size. It is freaking hard to make an intuitive user interface and a great user experience on such a small screen.