The "other site" is Harmony Central - acapella.harmony-central.com

It has its moments, but there are a few people who spend most of their time being rude. If you ignore them there's a lot of good information.

And yes, the VG-88 is the unit you're thinking of. It does pickup simulation, amp simulation, alternate tunings without changing the tuning on the guitar, synths, acoustics, nylon strings, organ, bass, banjo and more. Plus a decent FX section on top of that. The only downside is having to have the hex pickup on your guitar, but I have an internal GK2 installed, so it's not too obtrusive.