To me, without that Wal tone, BSSM would not be half the album. Observe that StingRay get so lost in the mix in 'The Righteous and the Wicked'. To me, Flea is a retarded punk rocker that could have the Peppers sounding huge forever but instead went for 15 years of light & fast basses, and people ranting 'rhcp not the same band anymore'. It's unnerving to see the guys @Woodstock 99 pretending to be hittin' any real Give it Away vibe - when there's none of it there - half of that is the fat badass bass! Also most people talk about electronics but if by 'Wal sound' you mean the thickness of it, IMO you are looking at that mahogany core in the body, and generally the properties of that body, not EQs or filters. Or else, you would be able to cop that out from some pedal boxes in the floor as well. It's in the wood..