Not a long time ago I got a fretless bass and started to learn to play it. Last week I took it to a rehearsal with my band and we played some of our material which was written for the fretted bass. What I noticed (besides being bloody out of tune half the time, but that is another story) is that my lines didn't sound like fretless, they were like the fretted bass with the timbre of fretless if you know what I mean. I tried to embellish the lines with slides and vibratos. At that point, it was already heard that it's fretless, but I still wasn't satisfied with the results. What are the basic must-know techniques and tricks (or even cliches) that I can use to utilize the full potential of the fretless bass?