Casio Prvia Px-860 Increase Volume For USB Recording?

[Mankeys]

Hello friends, Happy Holidays. So what I am trying to do is increase the volume of a USB recording to a flash drive on the Casio Privia Px-860. I find that when I record to a USB the volume is a little low. What I currently do is take the flash drive to my computer and increase the volume of the recording with audacity. However I saw in the manual (page EN-25) that it is possible to increase the volume right from the piano, but I don't understand...it tells me to hold the function button and press some keys. That's the part that I don't understand, which keys?

[Brad Saucier]

I think they meant that audio volume adjustment is for playback level, rather than recording level.   I may be wrong, so try it anyways.   The manual refers to a chart which shows the keys to press.  It's page EN-29.  

[Mankeys]

I saw the diagram but I can't figure out which keys they are referring to.  All I know is they are referring to some keys on the right of the piano, but it doesn't specify which one.

[Brad Saucier]

The manual points to the highest F and F# keys on the piano.  F is to decrease, F# to increase volume.  Press both simultaneously to reset defaults.