Infinite, Regarding your volume pot crackling problem, i think it's a normal problem in the Js1000 series. I have a JS1000 White 01' model and it gives the same problem whenever i turn the volume knob. Try this, Use your left hand to touch all the 6 strings lightly(but make sure all strings are touched. DO NOT PRESS, just Touch to mute it. Then use your right hand to turn the volume knob as desired. Sounds weird but true. it has helped me alot. not even a single bit of sound after i do that. as in putting the left hand to touch the strings lightly while i turn the volume knob. Cheers!
hOpe it will help you.