Cat posing proudly on a Roland SH-1000 synthesizer. From Ian Alexander Ratzer.

Bass lines with a phatness. SH-1000 with the filter up. No effects necessary.

There is also a video with the cat and the bass line

The Roland SH1000 was one of the first of the “SH” line of instruments, as exemplified by the organ-like elements. From Vintage Synth Explorer:

The SH-1000 is a monophonic analog synth with a single oscillator feeding a lowpass filter, an ADSR envelope, and two LFOs. It features 10 Preset sounds, but they are pretty weak. Fortunately you can create your own sounds for some really great mono-synth bass, lead, percussion and FX sounds. Basic square, ramp and pulse-width waveforms are available from the oscillator and the LFOs have sine, square and sample+hold. It has a terrific ‘Growl’ and ‘Wow’ effect for a pretty scary analog sound. It also features white noise, pink noise, portamento, octave transposition and a Random Note Generator. Although there is no user memory, unique sounds can still be quickly recreated or discovered thanks to its simple interface.

http://www.vintagesynth.com/roland/sh1000.php