I've used Korg AX1B for years and years. It's an old and obsolete multi without much power inside, but it did the basic trick and went well with my cheap bass then.
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Now I've got a better bass, so I sold AX1B and bought something better, i.e. Korg AX3000B for $75. Some tact switch weren't working (mostly or at all), so I've replaced maybe 10 of them. Nothing too hard, any person knowing how to hold a soldering iron can do that. Did a factory reset, checked factory patches, was not particularly impressed.
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Found a good set of patches in the internet, downloaded it, sent it to the device using USB-to-MIDI interface cable, and now I'm happy. Especially with such patches as jazz (almost double bass sound), bass synth (great for disco and 80s music), slap (nuff sad) and hard rock (a metallic growl of 70s). There's many more, I haven't dig all of this yet.
The only downside I see for now is that the unit is BIG. Not will it ever fit into the pocket of my bass soft case, like easily did it's predecessor. I had to order a gun bag to put it in (gun bags are much cheaper than music bags

). But anyway the soung and ergonomics of the unit feel good to me so far.
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