The electro harmonix memory man with hazarai has a low pass to high pass one knob filter, true stereo, and has half a dozen different delays and a looper to boot. Couldn’t be more dub. Cons: filter only affects delayed sound, so you could set the delay time to zero and blend to 100% wet and just enjoy the one knob filter, but no filtering of both dry and delayed signals at once. No resonance control, but the sweep sounds pretty natural. Digital, not analog, but because it’s digital you get tap tempo and a load of fun features with different settings, reverse echo, ring modulator, etc. Plus, it’s only like £150?