Hey guys,I've been using the Eken for roughly two weeks now, but a few days ago the speaker started to make this rattling sound, no matter what the volume is set to/whether it's muted or not.I opened the case, remove the speaker since the wires seemed crappy, then soldered it back on, problem persists. Apart from the weird crackling sound, audio's all good.Also, while I was looking around, I figured I'd solder a USB port directly on the mobo, but couldn't find the right points since this is a Rev7 board, then again I don't know if there's something special required when soldering on top of the thin dark lines on the PCB (the ones with no tin).