Hello! I use my Korg D1 digital piano as a midi keyboard. I got a Roland UM-ONE midi cable to connect it to my computer. I installed the asio drivers and the Contact player. When I load any instrument in the Contact player, it sounds perfect on the headphones, but when I connect the Laney ah 80 amplifier with an aux cable, the sound is thin and very weak and not nearly as good as on the headphones. And also when I listen on the amplifier there is a delay while on the headphones it works perfectly. Does anyone know what the problem might be? Thank you.