Here is the list of parameters that can be edited with markers.
Sequence Volume—Changes the global volume of the sequence, similar to the master volume slider found at the bottom right of the sequencer.
BPM—Changes the tempo of the sequence.
Instrument Volume—Changes the volume of an individual instrument.
Instrument Panning—Changes the panning location of an individual instrument.
Instrument EQ—Separately changes an instrument's EQ per band.
Instrument Delay—Toggle Delay on and off.
Instrument Reverb—Toggle Reverb on and off.
Instrument Detune—Allows pitch bending of an individual instrument.
Autoscroll—Changes Auto Scroll settings that can be found at the bottom right of the sequencer.
Fast Graphics—Activates Fast Graphics mode that can also be found in the "More tools" menu next to the Help button.