How do alter the volume of a REX sample???

Evening,

I’m probably being thick here but i cant seem to lower the volume of a REX sample i’m using. On WAV samples there is a little square box in the middle of the rectangle that has the waveform picture in it, it’s not there on these REX samples. Someone please tell me how to do it

Thanks

Double click the Rex file… In the sample editor select all the parts and use your rectangular thing as normal