Hey guys, I had another fun suggestion in addition to all of my other ones.
If you want and can, you should either emulate tube amps from Marshall,Vox,Peavey,Line6,orange or any other amp brand you can think of, or you should design your own digital tube amps based on some of the cool tube amps from these companies. I think it would be a lot of fun to do!
as for guitar effects for those amps,just look at rakarrack and that is a good basis for effecting guitars. but if you write effects pedals change rakarrack and make it your own.
I am working on some stuff similar to this so have fun with it.
Also, you could totally emulate drums like dw drums or yamaha drums or any drum synth and that would just enhance functionality of guitarix so we can listen to ourselves with a beat in the background.
if you emulate drums though, you should totally make drum effects so we can effect the drums and get really techno style drums to play guitar with.
I am sure I will have more for you guys because it is fun and interesting!