 Oberheim went on to design other products for Maestro, including the Universal Synthesizer for guitars.Oberheim's forays into the design of equipment to be used by musicians continued to evolve.His associations with Richard Grayson and later Paul Beaver nurtured an interest in synthesizers, and at the 1971 NAMM Show, Oberheim approached Alan R. Pearlman, founder of ARP Instruments, asked to become the company's Los Angeles dealer, and subsequently became ARP's first dealer on the west coast, selling ARP 2600 synthesizers to musicians in the Los Angeles area, including Leon Russell, Robert Lamm, and Frank Zappa.