This simple template for AUM shows how you can use an Atom2 clip to trigger other clips.
Notes
* The triggered clips (2:1, 3:1, 4:1) are all set to HOLD mode, have Thru Input disabled and are set to trigger via MIDI notes C1, D1, and E1 respectively.
* Note also that the sequencer clip must be routed into each of the triggerable clips
Direct download (via Dropbox):
https://www.dropbox.com/s/bjadtv47ro3uzau/Template%20-%20Atom2%20sequencer.aumproj?raw=1

Here’s a screenshot showing how the sequencer is being routed into each of the triggerable clips.
Attachment u2od1s58dnbj.jpg