Pro pedal is basically low speed compression. It eliminates/reduces pedal bob.
Older rp23’s had 1,2,3 and the little lever to switch the pro pedal on or off.
Off is great for descending/riding over rough stuff when you want the shock to be at its most active.
Flick the lever on activates pro pedal you then set the level of pro pedal depending on your preference. 1 lowest 3 highest.
Newer rp23’s work slightly different
The pro pedal is always on unless you set it to 0. Flick the switch on and its at its maximum 3. Switch it off you decide what level of pro pedal you want 0 – off 1 or 2.
ctd is pro pedal with added fox marketing bollox.
C – climb pro pedal 3
T – pro pedal 2 or 1
D – pro pedal 0
They have removed the pro pedal numbers and made it easier for idiots like you to understand.