Jesse L. Jackson is not the only potential presidential candidate who has been busy registering voters.

Composer Frank Zappa, the 50-year-old guitar guru who runs voter registration tables at his concerts, said he has spoken with two Washington political consultants about running for president in 1992.

"We're just gonna do a little feasibility study to see what it would take," Zappa recently told Spin magazine. "The idea is that this is a zero-balloon campaign," he said of what he characterized as a low-key, low-budget operation.

Zappa, a political independent who wants to replace the federal income tax with a national sales tax, acknowledged that his chances of winning the election are slim. But he does have a track record for attracting political attention.

In 1985, the musical iconoclast stole the show at a Senate committee hearing when he denounced the wives of Sen. Albert Gore Jr. (D-Tenn.) and then-Treasury Secretary James A. Baker III for urging record companies to label albums that contain offensive lyrics. The following year, Zappa's lobbying helped defeat legislation in Maryland that would have made it a crime to sell "obscene" records to minors.

A spokesman for Gore, who ran for president in 1988 and who may run again in 1992, had no comment on Zappa's plans.