Not looking to get a bass at all, got everything I « need » atm.27111369[/URL], member: 340182"]I've used Cardinal and it's a great free way to mess with Eurorack. It's based off of VCV Rack, which is another option. VCV Rack has more modules, but I'm not sure of its pricing structure. If you try either of them I'd highly recommend Omri Cohen's videos on YouTube (a lot of what he does with VCV Rack can be done with Cardinal, though not all of course).
In the bass world, get an Ibanez Mikro. I have the five string and it's one of the best bang for the buck pieces of gear I've ever gotten. I've got mine strung E-C, and have done a lot of messing with it (pulled out the pickups and electronics, put in a different pickup complete with caveman-esque routing job, etc.).
Thanks for the other recommendations.