drum sounds vst not working

Cubase
#1

hello! I have had always the same problem with vst which should be like drum machines, or drum arpeggiators. I never manage to get ANY sound out from those. I see the vst (or cubase) recognizes the signal from my midi-keyboard, but NO SOUND, and this is very frustrating. All the other instruments work well, synths and stuff.

What is the trick behind drum vst’s? How to use?

#2

some vst’s come with sounds, if I push keys, but there’s no way to loop the sounds. Is it that I cannot use simple midi keyboard for that, I would need something with arpeggio system included?