Masking groups?

[ListenerJubatus]

I'm trying to use modV to create a UV-mapped visualizer for a VJ performance in a VRChat world. I'm trying to make a group that renders only in the stripes on the side like a mask. I did make a PNG texture that was transparent except for where the stripes are to try and use source/destination, but I'm not sure if it worked?

[HorstBaerbel]

Late to the party, but this should work using the appropriate blend mode between groups