Q: What?s the difference between Tone2 Electra2, Tone2 ElectraX and Tone2 Electra3 and do the presets all work in 3?
A: Tone2 ElectraX was the fist version of the synth it was released around 2011. Around 2014 it was replaced with Tone2 Electra2 (= ElectraX v2.0). The latest version is Tone2 Electra3.
All older presets work in the most recent version.