
Hi there,
so first thing to note: MIDI is not the same (equal) to standard audio output. Which means, you can't send audio through MIDI port --> it sends info data about what keys/buttons are pressed, for how long, how hard etc... So to answer your 3rd question first, it's not possible to play electro 2 programs and send them as audio to electro 6 and after that to amp/speaker. If you want to play sounds from both e2 and e6, you should connect both of them to amp/speaker.
On the other hand, if you want to use e2 as MIDI controller for e6, it's possible. You should connect them through MIDI port, and now there are settings to adjust it to work (there is already topics on this forum about connecting MIDI).
Thing is that you can now play different sounds from e6 using e2, and control e6 by e2 (I think vice versa too, but not sure about that one). For that, you don't need to connect Electro 2 to an amp/speaker, because you are only controlling Electro 6 with Electro 2, that being said, electro 6 should be the only one connected to the amp/speaker.
One more thing, if you want to control Electro 6 using your electro 2 via MIDI and still play some sounds from electro 2 too, it's possible, but look what I've wrote at the top of this post: in that case you should connect e2 and e6 with MIDI between them and both of them to the Amp/Speaker. Note that in that case you have to adjust programs to work for you so you can play sounds from e6 on e2, and both sounds from e2 and e6 independent.
Hope that helps.
