Although the album has never been reissued or released on compact disc, four of the tracks have been re-released without Douglas's edits.

[2] According to Hendrix biographer Harry Shapiro, WEA released the album in 1979 in Brazil with a different cover and sequencing.

[4] In a contemporary review for The Village Voice, music critic Robert Christgau gave Nine to the Universe a "B+" and called it "bracing progressive R&B" showcasing Hendrix's most jazz-oriented improvisations.

However, he questioned "whether tighter structures wouldn't have made [Hendrix] think harder and faster", while finding that Young, being the only jazz musician, sounded less "far out" than usual.

[6] Paul Evans gave it three-and-a-half out of five stars in The Rolling Stone Album Guide (1992) and said the ethics of Douglas' production were questionable but resulted in a fusion style in which Hendrix "sounds great", citing the album as the most "vital" of the Douglas-produced records.