From a 1970 Ludwig ad:

Ludwig innovation scores again with the most exciting new electronic approach to the music of the Seventies! The Ludwig Synthesizer Phase II doesn’t imitate sounds of other instruments—it creates an infinite spectrum of sound colorings to enhance and add dimensions to an amplified guitar or any amplified musical instrument.

The performer can create, manually or auto-matically, new sounds never before heard or produced. These "voices" are switched on and off thru convenient foot controls; console controls select the degree of effect de-sired. Ask for an electrifying demonstration at your Ludwig dealer or write for full details

today.