Hi, Jay. You’re not alone; because DS is fully RGBA a lot of compositing tasks are easier there. However, what you want to do can certainly be done, and it’s not even all that hard on Adrenaline with Sapphire2, just different.
Transitions can’t have Apply to Title/Key because the Avid requires transitions to take exactly two inputs, and for an effect to apply as a title/key it has to take three inputs. So you have to do it in steps.
To apply a transition between two titles (or keys, like you have) without affecting the background, first apply S2_MakeRGBA to both titles (that merges the RGB and alpha into a single RGBA super-clip), and add the transition effect between these titles. Then shift-select both sides of the transition (incoming and outgoing) and use the Collapse button on the timeline toolbar to nest them together. Finally, alt-drop S2_Layer on the nest to comp over the background, and you should see the completed effect.
If your Avid allows you to apply effects on filler, instead of collapsing the transition, you can put the S2_Layer on a filler track on top of that (alt drop), and select Background: 2 tracks below to composite over the background.
If you want to also apply other effects to each title or key such as distortions or blurs, use them instead of S2_MakeRGBA above, and select Apply to Title/Key. To wipe on or off a title, just use an all-black title for the other side.
Hopefully that helps get you going! Please let me know if you have any other questions. And don’t forget to check our Avid support page at https://www.genarts.com/sapphire-avx-support.html.
— Gary