Quote Originally Posted by jk_scowling View Post
Setting your amplitude envelope (and filter envelope) right is important to get the right dynamics with a bass sound. I often just use simple sine waves as a source, but then with a bit of perseverance you can shape a decent bass sound out of it.
.... and don't forget about velocity.

Most synths will let you adjust parameters according to the velocity of the MIDI note-on data. Experiment with using random velocities in your patters, or rhythmic variation in velocity. (e.g. Cubase lets you draw in velocity with Sine curves, sawtooths etc.)