Layers is a free pack by Orchestral Tools that runs in their Sine Player plugin. You can select full orchestra, woodwinds, brass and strings.
I was very impressed to see that this was free, and I was expecting some limitations. Indeed, you can only have 3 types of chords (Major, Minor, Sus4)--why the heck did they leave out the diminished and augmented chords?!
Anyway, it can still be useful for some small jobs or even for some compositional experiments, so I thought I could have a go at making something with it. However, there was another thing annoying me: Layers doesn't provide the score notes for the chords. For a composer that's the most important thing! How could I notate my experiments with these materials?
To sort this out, I used some spectrum analysis software (and my ear) and here are all the C chord voicings:
If you play C2, you get the first chord. C3, the next, etc. There are 6 voicings/inversions for each chord. This applies to all ensembles. If you choose strings, it's quite clear what notes the instruments are playing. But if you choose to use a full orchestra or another ensemble, then if you change inversions some instruments will appear in certain voicings whereas others will disappear. So still, if I wanted to notate in a score sheet every single instrument that was used, it wouldn't be easy to make it accurate.
I wrote a short compositional cliché to see how this could be notated. Here is the score and audio:
