Again, it depends on what you want to do. If you use the OUT on the front panel, it will be pretty much like plugging your guitar directly into the second amp. If you use the line out on the back, you'll have a hotter signal, which should easily overdrive the input stage of the second amp. The Model T's tone controls and the distortion generated in the T will all be present at the input of the second amp, so, if that's what you want, do it that way. Why not just try it both ways, and see which works better for you?