Hi DJB78ldn
The newer SYNCHRON libraries were recorded in the rooms of the SYNCHRON stage. As a rule, you will receive the instruments in question recorded with different microphones (e.g. Close, Mid, Room... or similar) The full libraries naturally contain more different microphones than the standard libraries or even the reduced libraries, which then become cheaper and cheaper.
By combining different microphones and using the panners in the mixer of the SYNCHRON player, you can actually place the instruments practically anywhere on the SYNCHRON-Stage. With a large number of presets, you can of course save time or use the presets as a convenient starting point and adapt them to your personal requirements.
The older STUDIO libraries (initially for the Vienna Instrument (VI)) were originally recorded in the SILENT-stage. At that time, the aim was to have as little room information as possible in the samples so that the instruments could then be acoustically placed in any desired room - e.g. with MIR.
Over time the Vienna Instrument Player was replaced by the SYNCHRON Player and the VI libraries were programmed for the SYNCHRON Player. So that the VI libraries in the SYNCHRON player could be distinguished from the real SYNCHRON libraries, the libraries were called SYNCHRON-ized libraries. Today they have clearly been renamed once more: Studio Libraries - because they do not contain any room information themselves.
However, it is important to know that the adapted Studio Libraries can still be used as original dry (with the preset “default”). But VSL provides a lot of presets with which the actually dry libraries can be placed in the SYNCHRON stage via Convolution-IR from the silent stage as if they had been recorded there. So you don't necessarily need MIR for these libraries either.
Especially when you use presets, everything fits together.
So your question about which type of library to buy cannot really be answered if you apply your criteria.
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I can tell you how and when I use the two libraries.
If I want a general and natural orchestral sound, then I use SYNCHRON libraries because the samples were excellently recorded in a good room, so you don't really need to add anything except a little reverb tail.
Example (Do you hear the Room of the SYNCHRON-Stage - specially with the Brass Instruments? (a bit overdone, of course))
If there is a solo instrument that should play acoustically close to the listener and clearly in front of the orchestra, then the (close) beautifully and dry recorded STUDIO Instruments are ideal for this.
Example (Note the beautiful presence of the two wooden flutes and how they separate well from the rest of the SYNCHRON Orchestra)
However, many of the new single-instrument SYNCHRON libraries are also suitable as solo instruments with their close and mid microphones.
Example (The new Solo Violin (played mainly with the lyric articulation)
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The last example could be an argument for the SYNCHRON libraries: With these libraries you get the latest technology (often 3 or more Mics), of course. Over the years, VSL has also gained a lot of experience in terms of articulation options and natural recording techniques for instruments...
So unfortunately it's up to you to decide. In any case it's important to know: With the mixer preset default you always get the original recorded sample - with Studio a dry one - and with SYNCHRON the original recording signals depending on the microphone from close to far.
Hope that helps a bit
Beat