It IS the original track minus guitars. The only guitar that's from the original is the rhythm track during solo. You can actually feel the tone difference. It's quite impossible to get GnR's tone though since Marshalls tend to be quite on the bright side and Budda Superdrive series are dark (especially 18-30 watts). Sometimes I think that a presence knob would make this amp even more versatile. Also, since it is a low watt amp, the tone is not in-your-face and punchy. Yet, I think Budda does an exceptional job blending with the original track. After all, who cares whether you nail other guitarists' tone? I don't think Slash's tone is any better than mine, it's just a matter of taste. Budda has a character of its own and that's what I like about it.