Thanks for putting in all the effort with LADSPA! I am, through Om, also a big user.
I'll go very simple and broad here and suggest 'APA', standing for 'Audio Plugin Architecture'. + Aypeeay has a nice sound to it + The name is forwards compatible with being ported to Windows, Mac, or even becoming a de-facto or ISO standard for cross-platform audio processing. + The name does not cause brain-overload + The name sounds technical enough to be recognized as such by ordinary users but is simple enough to be used in communication + It can be typed with alternating hands which makes typing it often faster + It is fairly obvious how to pronounce it - There might be the occasional joke about the American Psychological Association, the American Philosophical Association, or the American Psychiatrical Association - There are several European companies using the acronym as their name Carlo
