https://forum.vsl.co.at/topic/35248/Using MIR With Mono Instruments Which MIR Effect Plugin To Use/218693
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Mono stereo instruments
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Talking about Vienna Instruments, all instruments were recorded in stereo. The big exception is the Dimension series, were each player of the sections has been recorded individually by means of a mono microphone. As soon as you use the pre-configured "desks" or "all players" settings, it's a stereo source again.
HTH,
/Dietz - Vienna Symphonic Library