I create VST plugins. (I've created something like 96 of them)
I can tell you all right now, if this feature were to be added, I would instantly release (for free) a bunch of plugins for use with XBMC. They would NOT be open source, but these plugs would be free. I would then immediately create a reasonably priced commercial package as well. Like many in my field, I would not even consider LADSPA, I may however consider Mac AU. As far as Android goes, they don't support real time processing (at least not with live input from say a guitar, or mic, although I could be mistaken?).
I installed Media Portal specifically because they DO support VST plugins, however, I could not get that program to do a damn thing for me! I have never seen anything like that before, such a big program and absolutely nothing would work!
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Gamester17
Although VST is owned by Steinberg technologies, it is 100% free! That's why there are literally hundreds of thousands of freeware VST plugins available for download. XBMC would do well to implement this interface, Even MAC supports it! I don't know about Linux however, I have never seen it supported, and I guess that's because it is believed to be a Windows technology and anything windows to a Linux guy must be crap right? Anyways, I think VST and ASIO actually got their start on a Commodore?