First off very sad to hear of Jeff's sudden passing!.
I must admit the only stuff of his that interested me was his two albums Truth 1968 and Beck-Ola 1969 and the Beck, Bogert & Appice power trio he formed with American musician's bass player Tim Bogert and drummer Carmine Appice and the single studio album they released in 1973 plus a double-live vinyl album that they recorded in Japan in 1973. The jazz/rock stuff that he put out like Blow By Blow 1975 and Wired 1976 'went over my head' to be honest. A couple of albums that he put out in 1980 There And Back and Flash in 1985 were ok.