Hi John
I see your point, but in the case of Wersi OAS instruments up to OAS 6, (OAS 7 is totally a different format using a combination of sampling and Sound Modelling) if it isn’t in the sample then you can’t edit it.
As an example:
Let’s say the attack of the Piano is 20ms, then while the editor can increase the attack, it can’t decrease the attack beyond 20ms as this information is not contained in the voice/sample.
The same applies to modulation, if it is not contained within the voice/sample, then it cannot be added or modified.
Samples themselves come in many forms, some sample the whole instrument and some in sections, e.g. the sound is sampled separately from the modulation and the 2 are combined at a later stage. (Hence the modulation becomes editable separately from the sound)
There are many ways to sample, and just because you can’t edit something on one type of sample, doesn’t mean that it can’t be altered on other types of sample.
In the end it all comes down to the designer who has to provide what the musician wants.

Regards

Bill