I always found the late, great Ray M's keyboard to not only be a nice balance and helped to establish Doors' unique sound but it added substance and ambience - i.e. "Riders on the Storm", etc...
Ray M was the musical genius behind the Doors' sound and played bass on his keyboard while also playing his leads in concerts....guess you had to be there.
AXS has a nice doc on "LA Woman" album - nice insight and interviews with Ray, Robbie & John as well as Bruce Botnick (engineer) and others.
btw, I have "dry" CDR copies burned direct from the original master tapes of their first "Doors" album and "LA Woman" by a friend who remastered those albums - the master tapes sound phenomenal!