Hey Chuck,
You got me wondering too about Spectrasonic’s policy on this (I also use their software) .
This is their response to the question “Can I use Spectrasonics Virtual Instruments in music library productions?
Yes, this is fine. Some soundware companies restrict this kind of use (since music libraries sometimes cross over into the soundware business), but Spectrasonics allows music library use. In fact, we have many customers that use our products in music libraries.
Specific limitations about music library use include the following:
The music in the library must be mixed. You cannot provide separate tracks.
The intended audience for your music library collection must be non-musicians.