Mix with: Layer to mix the current layer with
Source: Amount of currently selected layer
Add: Amount of mix layer

Mix layers with map
Mixes two layers with an intensity-map

Mix: Layer to mix the current layer with
Map: Layer to use as a map
Channel: Channel of the layer to use as a map

Multiply layers
Multiplies two layers

Mul with: Layer to multiply the currently selected layer with

Mix channels
Mixes two channels

Channel: Channel of the source layer
Mix with: Layer to mix with
Channel: Channel of the mix layer to mix with
Source: Source layer intensity
Add: Mix layer intensity

Multiply channels
Multiplies two channels

Channel: Channel of the source layer
Mul with: Multiply layer
Channel: Channel of the multiply layer