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So I rendered a beauty multipass in Linear 32 bit just like all the tutorials out there instruct you to do. I also rendered out a Regular Image (main/beauty (this is a side annoyance that the naming conventions are consistent)) for comparison.
I put my multipasses into either Photoshop or AE. Set everything to linear 32 bit. Set all the passes to Linear Dodge (ADD). Turned off all the channels I don't need, which leaves me with:

• SSS
  Reflection
  Refraction
  Diffuse Indirect
  Diffuse Direct

The issue is my gold metal reflected material shows up without color after everything has been composited and my a few of my glossy materials turn white.
I also rendered the Filter channels (Diffuse, Reflection, Refraction). The Reflector Filter appears to hold the color for the metal, but for it to work I have to set the pass to Multiply and not ADD, which seems weird to me. Also, when I use the Refl_Filter my white diffused spheres turn black! It almost seems like they are suppose to be used with object buffers.
So where is the color in my metal material and what in the world are those beauty pass Filters used for???????

Side question how do you render the passes without a file name joined to them (ex. Cube_Dif -> Cube_Diffuse or Cube_DifI -> Cube_Diffuse_Indirect)?

Hi tjmurrin,
yes correct, you have to multiplying the filter pass with the row pass of each single component, please have a look at the documentation:
https://docs.otoy.com/manuals/products/ ... ty-passes/
ciao beppe