1. Go to Main > New Track > Keygroup. Repeat this again to create 2 keygroups.
2. Go to Browse and select a sample, then tap the Load button. Repeat this again with a different sample.
3. Go to Menu > Sounds > Edit Instrument.
4. Tap the Samples tab, then double tap the Samples drop down menu. Select 1 out of the 2 samples you loaded in step 2 here. This will be applied to 1 out of your 2 keygroups.
5. Go to Main > Select your other keygroup.
6. Repeat steps 3 and 4.
7. Go to Menu > Key Ranges.
If you can't see the Key Ranges option, tap the arrow button to the far right-side of your screen; this will bring you to the next page of the menu.
8. You will see 2 key range bars here; these resemble your samples. If you hold the Shift button and click the Record arm button to the left of each bar, then play your keyboard, you will notice that both of the samples you selected in step 4 are now layered on top of each other.
9. To split the key ranges, tap on one of the bars, then tap the Min and Max fields in the top-right corner of your screen to select the start and end point for each sample/bar.
