Yes, my Boss GT10 has one built into it. Never used it. I just got my new tube amp about a month ago. I've been modding it and have not had a lot of chances to play through it just yet.

Having said that, I got the GT10 mostly because I didn't care a whole lot for the tone of my SS amp with my pedals. Just didn't mix well. However, I can get some great tones from my SS amp and my GT10 together. I was planning on not using the GT10 with the tube amp, rather just pedals. But that more than likely will change.