loop, oscillate, reverse, hold nCache - Maya

- open Trax Editor.

- select object with nCache attached.

- select ncache clip in Trax editor.

- and

Extend lower corner of the clip to "loop" (repeat)

Extend top corner of the clip to "hold" at the last frame.

Check "oscillation" in the attr editor, and extend lower corner of the clip in the Trax editor.

Check "reverse" in the attr editor to play backwards.

*if you want to attach one cache file twice you can attached cache file again.