Reading about the LTP design on Aiken's site, he says there are three inputs you can use in this design. I have a learning mule that I like to play with and have been thinking about trying something out. Just want to run it past you guys to see if there's anything obvious I should be looking out for. I have a Sundown head that I've converted the clean channel on to handwired tagboard. It's a single-channel amp now because of that. Reading some things in the Aiken article gave me these ideas. Use the "std" input as the input from the preamp. Use the 2nd coupling cap input as the input from the reverb circuit. Use the 3rd input (at the bottom of the tail resistor) as the return for the neg feedback line, running the presence control from there. Will the amp blow up if I try this? I don't know if it will make any difference in the sound, but I like to try stuff out just to see how it works, you know?