The popular banjo tune Fireball Mail is a great place to enhance the way that you play slurs. For example, the first slide in the tune happening at the first full measure is from the 2nd fret to the 5th fret on the 4th string. To play this correctly the slide should be played fast and aggressively. This is also the case with the other hammer-ons and pull-offs in this song. Try to make them as crisp as possible so you can hear both notes being played.