Rhodes One-Key, RARE! DVD The Grandmother is an analog

The Grandmother is an analog semi modular

With nothing plugged into the jacks

This means that unlike a fully modular system it has a hard-wired (or normalled) signal path and will play without the use of patch cables

This can be very limiting and

Rhodes One-Key, RARE! DVD The Grandmother is an analogThe Rhodes One Key's rarity and function Purpose: The One Key was never for sale to the public. It was designed for a very specific purpose: for salespeople to demonstrate the iconic tone of a Rhodes piano in a compact, manageable package. Demonstration: By simply striking the single key, a salesperson could produce the definitive sound that made the Rhodes famous, giving a prospective customer an immediate impression of its sonic character.