Looks like master vol, blend then 5 stacked knobs. I'm struggling to come up for a use for 10 pots, but Phil Lesh is no stranger to knobs...I don't know what his old Alembic setups did, either.
Apparently he didn't either. I saw pic of one of his multi-multi-knobbers and they were all labeled with tape.
The basic 10 knob is much more manageable and easier on the memory.
Yam BB Club #3; Lane Poor Club #5;
Haggy Bass Club #7; Warmoth Club #18;
Tele Bass Club #24; MM Sterling Club #25;
B.C. Rich Club #52; U.S Peavey Club #306; Sunn Ownwers Club #82