Q1: I changed the configuration file to a new trigger mode. The default trigger mode is still used, instead of the new trigger mode.
A1: Make sure your computer is not set to hide the file extensions. Your file is incorrectly named "read.cfg.txt" instead of "read.cfg". Uncheck "hide extensions for known file types" under "folder options" and rename your config file to "read.cfg"

Q4: How do I adjust the volume of the board?
A4: All you need is a small star point screwdriver. The onboard potentiometer used to adjust the volume is the small blue square just next to the headphone jack. Turn clockwise to increase volume. Turn anticlockwise to decrease volume. This potentiometer only controls the onboard amplifier. It does not control the 3.5mm audio jack volume.
Q7: Is the square potentiometer able to be used to adjust the volume for the audio output from the headphone jack as well?
A7: No, the headphone jack gives an audio signal only to an external amplifier/active speaker/headphone. The volume adjustment relies on the connected devices.