No difference really except for the ED4 being a bit smaller than the ED8. If you don't need the MIDI in / out DIN, you might be better off just getting two ED8s.

Yes, eDRUMin 10 is available today. I will probably run out in a few weeks, but should have more units in about 2 months.

Are you using SD3 inside a DAW environment? Can you please send me a screenshot of your settings for any of your inputs in the eDRUMin control application?

The device is only available from this website. Perhaps you might find something second hand though somewhere else online. It ships as a small pack registered airmail. Typically Europeans get charged import duties, so that's something to be aware of. I will not declare a lower value on the package. ...

I don't think it would be wise to update it via the eDRUMin. It should work, but it's something that hasn't been tested and you don't want to be left with a bricked TD-12.

You have your eDRUMin set to use the Superior Drummer map. How about Superior Drummer? What map (preset I think they call it) is it using?

I don't think resetting is the issue. I think it's mostly a quality control problem with Lemon cymbals. I'm busy with other things, but I'll give this some more thought.

It's a tough call. There needs to be a balance between simplicity and configurability. I can probably hide that control and only make it visible for users who have advanced mode enabled. Let me know how the new ride performs.

Yes, that's correct.

Is this a metal cymbal? Edge sense probably won't work on metal cymbals. Assuming you don't choke your cymbals, then you won't gain anything else when using AD.