orange encoder in the synth sampler engine

so i’m still stumped on what the orange encoder does in the synth sampler engine…?

I see that blue changes the sample start point, green changes the sample loop start point, white changes the sample/loop end point.

what does orange do? it has something to do with the end point but I can seem to figure it out.

Also can you make a sample in the synth engine sampler just a one shot instead of a loop?

Release.I think orange is sample end point ,which plays in the release section ,after loop plays (through sustain).So after you release a key.
We need long release in envelope to hear.This is a possible way for one shots,depending on length of sample.Set decay full counter clockwise ,sustain full and release full.