http://www.peavey.com/assets/literat...03584290_4.pdf
go to page 8....
i have never had this amp before but from looking at that manual you should be able to get the clean sound...
but if you turn the stompbox knob to bypass push the amp button so it is on clean and put the effects to bypass you should get a clean sound and if that doesn't work try turning the gain down....also if you want to get fancy you could put the stompbox on bypass then select a amp(probably really doesn't matter which one) and then put the effects on chorus and you should get a clean sound
like i said thats just from reading that manual so if you follow that you should be ok but yeah if this helps ya cool if not let me know and maybe i could look at it again and try to figure it out haha o and if it is possable could you put a pick of that guitar i love sg's and i am curious what that one looks like i don't think i ever saw one haha