The simplest answer is that the standard license that comes with the purchase of a Spectrasonics Virtual Instrument covers any kind of musical use and does not cover non-music applications.
Here are several different scenarios:
• A “melody pack” or “chord pack’ could be collections of the user’s original musical phrases, presented as audio files which were created using Spectrasonics instruments. They may wish to distribute these musical creations to other producers. This type of use is allowed under our standard license, since it is essentially a type of music production and music licensing. The only exception is if the audio files are to be embedded in other software or hardware, which would require clearance with us.
• A library of individual one-shot sound samples is not music, so the standard license that comes with our products does not grant a license to use our sounds in this way. If the sample collection contains one-shots or multi-samples that contain our samples, then you must secure special permission/license from us prior to distributing those samples. It does not matter how much they have been layered or processed, it’s still required to contact Spectrasonics before release. Legally, it is considered a "derivative work" when our copyrighted sound recordings are involved in the creation of new sound samples.
• A composer/music producer creates musical pieces/tracks in different styles using Spectrasonics instruments for a music library company that wants to distribute them both with full mixes and with stems for maximum flexibility. Since it is music, this type of use is fully allowed under the standard license agreement that comes with Spectrasonics Virtual Instruments and does not require any special clearance.
• A user creates her own sound effects based on the core library sampled soundsources in Omnisphere and would like to distribute these sound effects publicly online. Since this is a non-musical use based on our copyrighted sound recordings in the core library, she should contact us in advance to clear the use.
• Same user creates her own sound effects based on her user audio or the DSP waveforms in Omnisphere and would like to distribute these sound effects publicly online. Since this is not using any of our copyrighted sound recordings in the core library, she is free to distribute them as she pleases and does not need to contact us in order to do so.