Add Image to describe Matrix mixers

README.md

 # MAMI - Matrix Mixer
 
-A set of modular PCBs that can be used to create a custom configuration for a Matrix Mixer. A Matrix mixer allows you to mix you any input to any output at the same time.
+A set of modular PCBs that can be used to create a custom configuration for a Matrix Mixer. A Matrix mixer allows you to mix you any input to any output at the same time. If you have for example a 4x4 Matrix Mixer, you have 16 knobs with each controlling a how much of a given input signal (`1-4`) will be mixed into a given output (`A-D`):  
 
-## Input Module
+![](images/4x4-matrix.png)   
 
-The Input Module has two 3.5mm Mono Input Jacks and two (On)-Off-On Switches that allows muting Inputs (or momentarily switching them on).
+For example by turning up the knob at the intersection between Input `2` and Output `B` we can mix all of the signal present at the input to the output. If we turn up another knob at another intersection, the signal will be present at both outputs:  
+
+![](images/matrix-examples.png)
+
+This makes Matrix mixers extremely flexible and allows for many possible combinations and use cases.
+
+
+
+## Input Module [MAMI-INPUT]
+
+The Input Module has two 3.5mm Mono Input Jacks and two (On)-Off-On Switches that allows muting individual inputs (or momentarily/permanently switching them on).
 
 | Top  | Bottom |
 | ---- | ------ |
 | <img src="gerbers/MAMI-INPUT_Combined_Top.png" style="max-width: 200px;"> | <img src="gerbers/MAMI-INPUT_Combined_Bottom.png" style="max-width: 200px;"> |
 
-## 2x2 Tile Module
+## 2x2 Tile Module [MAMI-QUAD]
 
 Mixes two inputs onto two outputs using 4 Potentiometers. 
 
@@ -18,7 +28,7 @@ Mixes two inputs onto two outputs using 4 Potentiometers.
 | ---- | ----- |
 | <img src="gerbers/MAMI-QUAD_Combined_Top.png" style="max-width: 200px;"> | <img src="gerbers/MAMI-QUAD_Combined_Bottom.png" style="max-width: 200px;"> |
 
-## Output Module
+## Output Module [MAMI-OUTPUT]
 
 Provides two 3.5mm Mono output jacks, with a Jumper (or switch) each row of tiles can be switched between unipolar and bipolar attenuation.