You want to remove the frequencies from the synth, leave all the bass intact in your bassline. Your synth would be opposing the bassline, meaning competing in the same frequency range.
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SH- 101, BassStation, Alesis Andromeda, Novation Nova, Virus TI 3.0.3 , ATC-1, Waldorf Blofeld... Lexicon, Line 6, Boss.... 96 Point Patchbay 
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