Hi, I already own a few amps but am searching for a nice practice amp. I want to buy 2nd hand and trying side by side is kinda hard. Does anyone know if the katana 50 is any good as a music playback device? According the reviews the gt40 is great for bluetooth streaming music. But Im wondering is the katana is any good when playing music from the aux in?? I know that the katana is not a real modelling amp and that is what appeals to me. Also it looks noce and sturdy. The gt is a modelling amp and not as stage ready and looks less sturdy but mighty purty. But what is important for me for this practice amp is te ability to play music with nice quality. Thank you for your suggestions / reviews / tips.