Samurai is an in-app purchase for koala that gives you:
3 Unique algorithms to stretch your samples so they fit perfectly with your song’s BPM, and change pitch independently of time. “MODERN” algorithm sounds buttery smooth, “RETRO” emulates classic sampler granular timestretch, and “BEATS” uses transients in your sample to make chops and loops to extend or shorten your sample
Edit your sequences on a grid, change pitch and velocity, also useful functions like copy/paste, reverse, stretch and legato are built-in.
Slices your beats automatically, auto (threshold based), manual and the classic lazy chop.
Here’s a video of how to use these features, and how to enable it.
If you don’t feel like watching a video, here’s a link to a how-to to show how to install samurai