VEGAS Pro's OFX has a big limitation which other OFX hosts don't suffer.
That is the Event FX of VEGAS Pro can't access secondary layer, which brings that third-party plugins can't function normally as in other OFX hosts. For instance, BCC in Resolve.
This is very unfair for Vegas users who purchased BCC, sapphire etc.
The Vegas limitation can be proved in : https://forum.borisfx.com/t/continuum-page-turn-ofx-alternate-back-sony-vegas/8962/2?u=summaryactivitynot
So it is necessary to Request Event FX which can access any other layer.
Another example : BCC Particle Array 3D
In Davinci Resolve, apply BCC Particle Array 3D to noise layer, set noise layer as BCC's texture layer (source B). Then set another spectrum layer (source B) as BCC's color layer :
In Vegas Pro, apply BCC Particle Array 3D to noise layer, set noise layer as BCC Particle Array 3D's texture (source). Then I want to set spectrum layer as BCC's color layer, but there is no (source B). It means Vegas can't make spectrum layer (in another track) as BCC's source B :