Hey so it’s my first time on talk bass and hopefully I’m able to get some help. So I own a Yamaha jp1 for a month now and I just now found out the bass has have 2 blue boxes I believe are called (potentiometers) apparently you can adjust !!! Question is how do I adjust ? What exactly does it do ? Will I hear a difference? Will I mess something up for messing with it ? Is there a wrong way to do it ? I NEED ANSWERS PLEASE