How do I get that "Phil Lesh sound"? (short of buying an Alembic....

)
I play through a SWR 2004 head/1967 Fender Bassman cab/Sans Amp di...basses at my disposal: Fender Hot Rod PBass, Warwick Corvette, or an Ibanez ArtCore....
any suggestions on settings, tweaking I could try?
Thanks!