Oh, I don't even understand this...LOL
Janet,
It is a preamp specially made for the very special RMC piezo pickup saddles, which are
one saddle per string, which isolates the sound from each string as a discrete signal, as opposed to all other pickups for acoustic instruments, where the sound from all four strings are just mashed together.
Think of four singers each in a separate room, each with their own microphone, going into a different CHANNEL on the mixer, which is like these RMC pickups and what this preamp can do,
vs. All four singers with their hot, smelly breath on each others faces into a single microphone, into a single CHANNEL on the mixer, which is like, every other piezo-type pickup on the planet.
The reason for this is because the preamp via it's 13-pin output, sends the audio signal of each string INDEPENDENTLY to a MIDI converter, which takes the PITCH it receives and converts it to MIDI signal so that you can PLAY ukulele, but have the SOUND of a piano, or any other instrument, and ALSO with the use of computer or iPad software, have the software transcribe your playing to TABS or even standard notation, in REALTIME, and in addition to ALL that, this Polydrive preamp and similar systems from Fishman, Roland and GraphTech are really awesome preamps and will sound like night and day improvements from nearly EVERY other preamp on the market.
No, I am not endorsed by RMC, and the seller here has no idea I am posting this message.
Just sharing what I know about this technology,
Hope this helps!
-Booli