Very kind of you dude.
The MC pickups are very much a full range pickup, very clear, powerful and even across the range of the bass. The regular B Series pickups are very very good too however, but each different model has it's own tonal input to be the mix, PB is a split coil P style, FB is a stacked sidewinder humbucker, SB is a single coil and the RFB is a side by side Musicman type are arrangement.
I would agree that the preamp is probably more Alembic than Wal in flavour, as the range of the ACG filters is much wider than the Wal, like the Alembic, but you also have more control over the filter frequency, as you can adjust the level on the fly.
The DFM also has a global mid/treble stack, whereas the EQ01 has a high pass filter, both are a really nice addition, beyond the limits of a Wal preamp. You can also add a passive tone knob too, which can be useful.
I don't think you'd have any trouble getting some Grateful Dead tones using either ACG filter preamp.
Where are you with your specs so far?