I'm not a keys player at all, in any way shape or form. I know one piano chord and that's about it. But when I wanted proper bass synth sounds for a prog project**, I did a lot of patch-tweaking on my MS-60B but then had little hesitation in getting hold of a wee synth (a Novation Mininova in my case). To give you an idea of what a crappy keys player I am, I had to put note name stickers on the keys. See attached photo for evidence of crapness. But I don't regret the move in the slightest -- yes I have more kit to carry around (well, not much really... synth, stand, two leads and a tiny mixer), but for those big phat and pharty MiniMoog/Taurus/etc sounds, nothing I've had from any pedal comes remotely close.
I'm not going to pooh-pooh the idea of working with pedals at all, experimentation is a lot of fun, but I would heartily recommend the idea of getting an actual synth. And let's face it, the forum name doesn't specify which sort of instrument is producing the bass.
** Sod's law being what it is, the project smashed into the buffer stops for the second time very shortly after I bought said synth. 🙄