how and when/where to use reverb ?

[eyeswithoutaface]

drums.

I love adding a touch of reverb to claps, hats and rides.

Also sometimes drenching the synths with reverb, printing it down to audio and resending it back into the sampler can have some cool effects.

Use it as a send though, and not as an insert. Verbs are notorious cpu killers.

indeed

look into getting a hardware verb, plenty of good un's can be found 2nd hand these days. I picked up a nice Lexicon mpx100 about a year ago cheap as chips, does the business.

in terms of software though Timeworks Reverb is my fave, LiquidVerb is cool too