Have you tried using AudioRealism Bass Line and using dynamics frequency gate in cubase? Turn it to listen then move the sliders to gate frequencys that are not needed.
TB303 + amp/Hot+ mic's = PsyBass 
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P4 3.6Ghz, RME Multiface, CubaseSX3.1.1+VST's, Virus TI Polar, TR909, TB303, Moog, EMS, Waldorf, Kenton pro2000.
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