It's nice to have some inside knowledge on the latest products. Every iem make has their own wat to tackle problems faced. ++++ is something new that I've learned today. As for the ED usage, I am not a keen fan of ER4, bought one and sold it after 1 week. Not much to say about those. Either love or hate. I am more of a Sonion 2389 fan. That sounds more musical to my ears. I also made something with CI dtec and swfk which was quite some challenge balancing the SWFK.