How do I change a sample to stop play when pad is released?

I've searched and searched all day, I've searched google, the forums, read the manual and the FAQ and I cannot find it!

I've got a feeling it's pretty obvious, but I cannot get it to work.

Anyways I use JJOS2XL (free) for mpc2500, and I want to change a sample to stop playing when I release the pad. In Akai OS I would do this by go PGM -> Select sample -> Window -> change the option there.

Thanks!

Global Program Edit [MODE]+PAD7 or PAD11

then change the sample's play mode to NOTE ON

http://www7a.biglobe.ne.jp/~mpc1000/os2xl/gpe_amp.htm