The Pitch Shifter feature has been introduced in FV Player Pro version 8.0.27.
It lets your users transpose the pitch of the audio track by +/- 5 semitones.
The Pitch Shifter shows as a “note” button on the player control bar:

Clicking the button shows the menu to let you pick the pitch adjustment:

Once you select the desired pitch, it shows next to the button:

This feature works together with the speed control as well.
You can test both features here:

Note: The pitch shifter functionality does not work with Safari and iOS due to core browser limitations.
The Pitch Shifter feature is enabled on a per-player basis. First it needs to be checked in wp-admin -> FV Player -> Settings -> Post Interface Options -> Pitch Shifter. Then you can enable it for any of your players using Options -> Controls -> Pitch Shifter in FV Player Editor.
