In the video, while showing off his vintage Fender Telecaster, Ludwig also presents a vintage 1960s era multi-effect pedalboard known as the Gibson Maestro G-2 Rythm N Sound effects unit

recording engineer Bill Skibbe: “Baby Says” – that modulating guitar sound, and a lot of the tone in that, comes from this old Maestro Rhythm & Sound pedal, which is more of a suitcase than it is a pedal. It comes in a big Samsonite suitcase [laughs]. They''re awesome because they have the original Maestro Fuzztone in them, and then they have two tone stops that going along with that, and they''re unreal sounding. They also have insane modulation that I always think of as like an African Manu Dibango sound—this messed-up, fuzzed, modulated crazy sound. It''s also got an Auto-wah in it, and a bass synthesizer, which we didn''t use because it doesn''t track very well. It really blended well with the Twin. It''s an effect that you can''t get out of a tremelo that''s on an amplifier.

Behind the "Beastie Boys" logo, you can see his Maestro Rhythm & Sound G2, which he uses the Subbass plugin on Adam Horovitz's electric guitar for "The Maestro" (hence, the name of the song)

In this photo, Ad-Rock is recording with the Maestro Rhythm & Sound G2. There is a similar model, the G1, but since the G1 does not have a black button, you can definitely tell that this effector is the G2. Based on the explanation in the link below, it seems that he used it in the recording of "Check your head" album (1991-1992). https://www.udiscovermusic.com/stories/beastie-boys-photos-career-gallery/

In this photo shared by Epworth on his Instagram account, the Maestro Rhythm and Sound can be seen.

the Maestro Rhythm & Sound G2 can be seen in this image

Seen at 14:03 in video