Thank you! To be perfectly honest, the BBCSO Core samples are recorded in such a way that simplifies mixing. I didn't do much other than adjust the volume levels and a bit of reverb. There are no mic placement options in Core; every instrument is just recorded at the location they are in a full orchestra. This can be frustratingly limited at times (e.g. all the percussion is way in the back) but it's also handy for people with less experience mixing orchestras, like me. Even the panning is built in. It can be a little inflexible, but it's useful for quick work.