Tested the PS1 Dual Analog with the Dreamcast controller adapter. A regular PS2 Duel Shock also came up the same for the first two modes.
Gamepad Mode
Left Analog Stick - Does not work
Right Analog Stick - Does not work
Dpad, Triggers, Face Buttons - Matched to Dreamcast
Dual Shock Mode
Left Analog Stick = Dreamcast Analog Stick
Right Analog Stick = Does not work
Dpad, Triggers, Face Buttons - Matched to Dreamcast
Flightstick Mode
Left Analog Stick = Dreamcast Analog Stick
Right Analog Stick = Does not work
Dpad - Dreamcast Dpad
Trigger, Face Buttons - Buttons Remapped
No luck on getting Dreamcast FPS movement with the Analog stick. The four face button standard FPS movement is the same when using a PSX controller adapted to the Dreamcast. However, a two player Arcade stick works when modded as a Twinstick, though the camera and movement would be digital. The Face buttons are controlled by player two stick, I have done this with a
Blaze Twinshock.