I have been using Yousician for a long time with a Rocksmith USB cable and have no troubles at all. But lately I bought a license for GP7.5 and would like to get my instrument input there. I have tried ASIO but the lag is barely better than the standard Windows input options.
I am considering adding a USB device like a Focusrite Scarlett but I would lke to hear from some of you who may have already been through this process. If the lag can't be lowered to an un-noticable level then I will save my money and keep my GP output separate from my guitar's output and run them both through the same speakers.
For reference, my laptop is a core I7 and i think my desktop is an I5.
Uke: Complete Lead (perfected L5), Complete Rhythm(perfected L6)
Bass: Complete (perfected L2)
Piano: L5 Classical (perfectedL2), L4 Pop (perfected L2)