currently you need to apply the changes you have made to the sample editor parameters (in/out/loop points, loop mode ...)
this extra 'apply' step is easily forgotten and can be a bit annoying to do.

possible solution would be to remove the apply button and implement one of these 2 options :
- change the 'play' button behavior so it acts as a 'apply changes + play'
- apply the changes you make on the fly (that way you immediately see the changes you have made in the bottom window)