This pickup option can make the instrument infinitely louder. It is not a way to be heard in a group of acoustic instruments, since the sound is quite "electric", very pleasant but not compatible with unamplified instruments.
This option, only available with an instrument purchase, includes redoing all the bars with new felt. This is most applicable to rearranging chord bars on a Chromaharp 21 bar but may be used to ensure greater felting integrity on any instrument. This option would put the chord bars on par with any luthier instrument or be comparable to refurbished bars.