Better! Although ... one last modification? The transition appears to be WL -> CaK -> Ha, and that goes great. But then instead of the WL image reappearing, CaK appears for a brief moment. So you could either jump back to the WL image (and hold it as before) or reverse the order (from Ha go through Cak and then to WL) with the same delays.
I think the latter is what you were trying to do but you didn't add the hold on the CaK during the return.
I'll stop now ...
Sheesh! Yeah, it plays WL-CaK-Ha and then back down to CaK and back to WL again. You have to travel through CaK to get back to WL. I just didn’t add the second delay on the 100% CaK image. There is one frame of WL, followed by 10 frames of CaK, followed by 10 frames of Ha at various transparencies for the transition. The reverse is the same, 10 frames of Ha followed by 10 frames of CaK to the single WL image.
Think of it as getting on an elevator on the photosphere and going up two floors to the top of the chromosphere but stopping a second on each floor. Then you take the express elevator back down to the photosphere rapidly passing through the lower level of the chromosphere.