a virtual analog synth such as a ms2000, microkorg, alesis ion and microion. u can also filter samples for basslines. do a search on this site for
low + end + theroy
ha ha just put this in the bass dru thread but is relevant here:
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yeah dual filters are your freind...something with resonance on both high pass and low pass...that way you can filter the top out- perhaps make a little resonance notch for low-mid audiblitiy and then high pass at say around 80-100hz or lower and crank the res up- that way you have clear tuned bass without the flab....