I have a set of all tyros 4 mega voices in giga sampler format, they sound actually quite good... They where once created for the lionstracs, but they never got marketed.. Anyway, megasamples are nothing but a set of velocity sepperated samples.... A mega voice could hold 5 different guitarsounds, with each their own vellocity range... Hard to play real time, but not that hard to recreate, there are enough tables available of how these mega voices are build up.

And Dan has something in Varranger that converts mega sampled sounds to normal sounds, seems to work great for the varranger community