The monophonic ES M (ES Mono) synthesizer is a good starting point if you’re looking for bass sounds that punch through your mix.

ES-M features an automatic fingered portamento mode, making bass slides easy. It also provides an automatic filter compensation circuit that delivers rich, creamy basses, even when using higher resonance values.

ES M produces sounds using subtractive synthesis. It features an oscillator that generates harmonically rich waveforms. You subtract (cut, or filter out) portions of these waveforms, and reshape them, to create new sounds.

If you’re totally new to synthesizers, it might be best to start off with Synthesizer Basics, which will introduce you to the terminology and give you a great overview of different synthesis methods and how they work.