Does the torch function in 2T with the amp control? You should try it again. How are you using it exactly? How are you determining it is not working? What are your 4T settings? IIRC, it will not allow the torch to control the amps below the start (or end?) current? I'll have to check that aspect as I set it for low current for 4T starting/ending amps. If it allows you to set it to 4T with 01, that part is correct. But slope should block the current adjustment feature until it slopes up to the determined amp setting on the torch. There is a possibility too that the torch knob responds more slowly according to the slope setting. (Will have to test several settings, but the unit I have works with the knob in 4T.