Pressing the MACRO key opens the MACROS page which gives an overview of each macro setting:

In the image above MACRO 1 (M1) has no external modulator. It is assigned to Brightness and it is at 100% (1.0). The / under None is show a 1 to 1 ratio (see below)

MACRO 2 (M2) is being modulated by CV 1X and is assigned to HUE. CV 1X value is shown in green and the M2 knob value is show in orange. / means 1:1 ratio. It is currently selected (denoted by the white triangle next to CV 1X).

MACRO 3 (M3) is not being externally modulated, is assigned to Saturation, and is at 100%.

You can change what the MACRO knobs do by pressing the EDIT MACRO soft key to enter the MACROS/EDIT page for the MACRO:

Use the ENCODER konb to select a control and press the SELECT key to choose it. Press the CANCEL soft key to exit this page.

Press the EDIT MOD soft key to access the MACROS/MODSEL page:

The window shows the macro name (Macro:) you are modifying. Under that is the JOYSTICK status and the Value mapping. Use the ENCODER to select the modulation source you want to map to the selected parameter.

The sources are:
NONE: Disable modulation, use DEFAULT value from VALUE/RANGE information
CV 1X, CV 2Y, CV3, CV4, CV5: The front panel knobs of the same name
LFO 1-8 : internal STRUCTURE LFOs (from MOD VIEWER page)
ENV 1-4 : internal STRUCTURE envelopes (from MOD VIEWER page)
MATH 1-4 : internal STRUCTURE math functions (from MOD VIEWER page)
MACRO 1-3: The front panel MACRO knobs
FREQ H / M / L: Frequency High, Medium, Low – assumes an audio signal in CV 1X and uses a frequency level average as a modulator
C LUM : value based on the luminance of the center of the screen
MID C:A : Convert MIDI notes to 0-11 to 0.0-1.0 modulation. Set in SYSTEM page
MID C:B : Convert MIDI notes to 0-11 to 0.0-1.0 modulation. Set in SYSTEM page
MID C:C : Convert MIDI notes to 0-11 to 0.0-1.0 modulation. Set in SYSTEM page
MID C:D : Convert MIDI notes to 0-11 to 0.0-1.0 modulation. Set in SYSTEM page
CC S#1 to CC S#32: Internal STRUCTURE continuous control slots, NOT to be confused with MIDI CC – however, the default STRUCTURE routing is MIDI CC #1 to CC S#1, MIDI CC #2 to CC S#2, and so forth.

NOTE: the incoming value is ADDED to the MACRO knob value, so you will probably want to turn the MACRO knob all the way counter-clockwise to see how the MOD SOURCE is affecting the OUTPUT.

Pressing the JOY X/Y soft key will cycle though assigning JOYSTICK X, JOYSTICK Y, and no JOYSTICK control to the selected parameter.

Pressing the VAL MAP softkey will cycle through different ways to translate the incoming value.
1:1 Val : / One to one mapping. Value 0.0 is 0.0, value 1.0 is 1.0
Invert Val : \ Inverted mapping. Value 0.0 is 1.0, value 1.0 is 0.0
UpDown Val : /\ map values 0.0 to 0.5 from 0.0 to1.0 and values 0.5 to 1.0 from 1.0 to 0.0
DownUp Val : \/ map values 0.0 to 0.5 from 1.0 to 0.0 and values 0.5 to 1.0 from 0.0 to 1.0

Press the SET soft key to update the modulation source. Press the CLOSE soft key to close the Select Source window and return to the PARAMS/CTRLS page.

A favorite modification is to change MACRO 3 to ‘Time Control’ so you can speed up, slow down, or reverse SHADERS that modulate based on system time.