Here's a video of the charismatic Allan Marcus playing one of his 8 string guitars through a Colossus H-100. Allan is a full-time luthier for Strictly 7 Guitars, a bad ass player, and one funny dude. The amp is running at bedroom-ish levels for the first two clips. The video was recorded in the evening and he couldn't really crank it up. The clean bass demo at the end was at performance volume, as you can hear by the iPhone mic clipping in parts. Skip to 1:30 for some 8 string action through Lead 1 (Andy Wood voicing mod engaged), 2:40 for some soloing on Lead 2, and 4:10 for some bass-style playing through the Clean channel.