So then many of their most well known songs have Ray playing left-handed keyboard bass. Even with a bass player later on I still think they have a different sound. What is it jazz/rock or something?
I never see a bass player when they play live, this says they used a session guy in the studio because the keyboard thing didn't play as well as it did live:
Ray played Piano, Keyboards, Organ. He had a love for the blues and a heavy liking for Jazz music. After Robby Krieger and John Densmore were added to the line up on guitar and drums respectively - they still lacked a bass player. The solution arrived partly due to a technique ray learned from boogie woogie piano ( the left hand plays all the bass parts ) and also with the aid of a Fender Rhodes keyboard bass sat atop rays vox continental. Ray Manzareks left hand became the groups bass player! It would continue that way through live concerts - though as the Fender Rhodes wasn't so great in recording studios in terms of fidelity - they would switch to using assorted session guys for later albums.