It is very easy to edit sounds on the X1/X4. Just push the edit voice function key and you're there! At this point you can change filter, envelope, LFO, etc. and then hit save/enter and you can save your sound. The 8000 and 9000 keyboards are the same action, and as Fran said the X1 is semi-weighted. The keys look just like any other 61 note synth keyboard, but if you feel under the key you will feel a glued in weight. This is what makes it semi weighted. The selling price for a X4 will vary because there will be 4 different models offered. If you want prices you will have to contact one of us dealers directly. I don't quote discount prices on this forum. This forum is primarily to discuss topics and ask questions about keyboards and the way they work.
Kaye's Music Scene
Kaye's Music Scene (Closed after 51 years)
West Hills, California