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How can I loop samples with zero crossing points for seamless loops on iPad
I’ve just bought AudioLayer and would like to create seamless loops of instruments (strings/guitar etc...) on iPad to use in AudioLayer.
Is there any apps for that.

Comments
Audioshare's Trim and Fade works (stunningly) well with it's hold-auto-zoom. It doesn't zero-cross, but has adjustable fade (default 3ms iirc) in/out to smooth edges.
For precise zero-crossing Twisted Wave rules and you can export the selection via 'Open In...'
(you have to get used to the zoom swipe up/down: dragging exactly on the playhead position keeps the visual focus at it's position.
The more distant from playhead you drag, the more the focus moves to the opposite direction. The trick is to not accidently tap the screen, as then the selection is lost.
I use Audioshare in most cases (as most of my records are by AUM), but Twisted is the best waveform editor in IOS. Screen handling and display are outstanding.
I find that the new Auditor app though lacking other features at the moment does a mean job of automatically creating smooth loops. I use Hokusai for sample torture (time stretch, FX, etc) and AudioShare for quick and dirty edits.
+1
AL already has an integrated sample editor that can zoom down to sample level and has a crossfade function to fix loop clicks. Other editors don't add anything new.
Looping at zero crossings won't always give you seamless loops anyway.
I am not entirely sure what you are asking.
If you want to make a seamless loop, AudioShare or Auditor does great.
But if you are trying to create a looped section in your sample, to create infinite sustain, you would do that in the sampler itself, usually.