I would recommend turning it up all the way. The only parts on that board that aren't going to like a ton of heat are the LEDs, but they will take solder very quickly.
Okay, thank you so much for the help, after fixing that, all the LEDs are on and there is no smoke. The only issue I have now, is that when testing the headphone jack voltage, it jumps up to 22 volts for a split second instead of the 9 recommended. The volume knob is turned all the way down, is 22 okay, or do I have another problem?