My 9 year old has a Pure Tone: Kids Electric Guitar and I just bought a Roland Cube 10GX Guitar Amplifier for his christmas present. I tested it and found the cable/lead is broken on one end. It hasn't had much use but obviously needs replacing. I don't know anything about Strings the nearest I got to music was playing my horn. Is it like HDMI cables where they work or they don't or are the more expensive one better?