The problem must be the lack of universality in this addition.
Why do it ONLY in Reaper?
It's obvious that it's a huge leap forward but if PG does not validate it there must be reasons?
Nothing else works with wma. You could maybe do it with Studio One but you need wav.
How many users have Reaper compared to Biab or any other DAW ? The only thing it would do is sell more Biab if it was made to integrate with Reaper.
I have seen PG fight change so many times over the years but eventually down the track they realize and implement things. I remember users asking for a PDF manual to see all the things Biab can do before buying (this was when every single DAW had a PDF manual download), so I just uploaded one but PG deleted it, can you download PDF's now ?
It's the same deal with so many things over the years, once they wake up and see, then users get these things. It's just a very slow long drawn out process.......
They don't venture out of their little world in the corner of the internet to know what's going on in the outside world.
How many employees at PG are working day in day out in a studio environment adding extra instrument tracks to other session ? how many are working in a creative environment where a smooth easy non frustrating workflow is needed ?
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If they were you would see it go way ahead because of experiential knowledge.
I think it's always been a "FUN" thing for them, that's why it had cartoon EGA graphics for so long.