Can not hear hit point.

Hi !
Im using C7.

Now i trying to edit hits of recorded audio snare drum track.There only snare sound with no others instruments.
So i adjusted treshold to needed level and sliced it and when i point the mouse to event and press play back slice - i cant hear that slice.It plays but with no sound.
Why it happened ?

In manual of cubase ( PDF in help) page 348 there one chapter : auditioning and hitpoints - and there wrote : you can audition the hitpoint slices … and so on…
but no word about how to set cubase if i cant hear this slice.

I hope you understand my question.

Thank you!