Can I turn Shape Layers into Masks? Open to any solutions here.

[OTG197]

Not sure if this is possible, or if there are any other work arounds to accomplish what I want that you all could suggest, but basically I want these white shape layers I used to cover portrusions of the letters moving/forming to accomplish the same thing on a transparent background as they do on the white background. I was tasked with animating this businesses logo for an email signature, and what I did seemed pretty good, until they told me they wanted it to be transparent. How should I go about covering the portrusions of these black shapes/assets in a way that works on a transparent background?

[Towerguy]

Hi. Try using a Track Matte. Create a Black solid under your logo and set it's track matte to Luma Inverted.

[Rick Gerard]

Pre-compose all of the letters that make contain the white solids. Apply Extract to the pre-comp and crank down the white levels and you will have your transparency in a couple of seconds. The white softness will smooth out any rough edges. You will have a lot more control over the edges than you get with a simple Luma track matte. I threw extract on the top part of your low-resolution screenshot and put a 100% red solid below it so I could see every edge and got this in about 15 seconds.