Add the white flash on a track above the current gradient.

if I do this then the gradient will dissappear.
becuase the black area around the flash is not transparent.

I guess I should add that I want the gradient to and text to stay while the flash occurs

Limit the size of the flash using Pan/Crop so the lower track shows through?

Use Luminance so the black can be keyed out so the lower track shows through?

Sorry, but I can't picture in my mind exactly what you are trying to do.

Put it on upper Video track, set Compositing mode for the short flash event to "Add" instead of "Alpha" to get just what you want.
A.

Or could render one part uncompressed or compressed lossless, reimport into Vegas in place of your first effect and add the white flash?

FWIW, IMO and all that, sometimes it's quicker to just do a quick, partial render then figure out & test a method that's more efficient, but takes you longer to get there.

ill try that alex B.

to explain

picture a horizontal red horizon (red gradient) that rises then falls in about 5 seconds.
as it rises some text appears (white) and you can see the horizon behind it.

When I a certain part of the music strikes I want the screen to flash all white using another gradient. But I cant add the gradient. I tried using another track but If I set
the flashing event to a higher track then all dissappeared. I want the text and horizon to remain on the screen while the flash occurs.

I thought about rendering it a event but then I dont have any editing of the red gradient or the text if I needed.

I will try alexes resolution to this.

Auggy

I still don't understand?
These two statements seem to be at odds:

- I want the screen to flash all white
- I want the text and horizon to remain on the screen while the flash occurs

sorry philfort
well if I set the flash track above the gradient track or text track then
they (the gradient and text) are both gone. All I see is the flash track.

I want the flash event to happen while
the red horizon and text appear.

I guess I don't understand what the flash looks like. You must want part of it to be transparent so the text/horizon appear beneath it (or around its edges). So the problem is that the flash has opaque black around it instead of transparency? So I guess AlexB's way will work.

I don't know where you got the flash media, but the easiest thing to do would just be to ensure that it is transparency where you want it to be, then you don't need to mess with the compositing modes. Is the flash some sort of Vegas generated media? If so, then that should be easy, since you can set the opacity of any color you use in generated media.

got it.

I'll give it a go and let you know how it goes.

Thanks for the direction