I am experimenting with VSTs lately to try to make some nice bass presets I can use (LMMS doesn't have many). So do you have tips on how to make a nice basic bass? I experimented a lot, I usually took a sine wave for the base bass, and then stacked triangle, saw wave, etc. and experimented with oscillators with many harmonics. At the end I applied usually a low pass filter, to soften the harsh harmonics. While that procedure was kinda -ok-, the bass sounded rather flat and without depth. It hadn't this 'crispness' and thickness like the basses I hear in various songs.
Try animating the filter with an envelope generator with a snappy attack, adjust decay and modulation depth to taste. Keep the cutoff frequency relatively low, using the envelope to shape the frequency response - this will let you balance a punchier attack with a deeper bottom end in the decay/release. If it gets too clicky, increase the attack time a bit.