When the Program mix parameter is at 50%, the Mix of the Wet and Dry signals are both at 100%. Adjusting the parameter in either direction reduces the volume of the Wet or Dry signal.
There are many ways you can adjust the mix of either your Program or Presets, there is no right way to determine how it will work for a given user’s setup. If you’d like to use the P Mix at 50% you can try using kill dry for your Presets. This will make it so the Dry signal is preserved using the Program mix, and the Wet levels of Preset A and B can be adjusted using the Preset A and B Mix level.
All of the Factory Programs were created with a P Mix level of 100%, so if you change this to 50% you may need to adjust other parameters in the Programs to work with your setup.
