Yes, I agree with you. A concert flute is tunable (as are all other winds), and when it was sampled individually, the pitch was probably not checked properly. Pity, because all of the instruments in this library are true to life and believable.
Here's the latest: I did a search first for a flute VSTi plugin to replace that one track. Found plenty, but were mixed in with a lot of other instruments and very expensive. I'm not against spending money, but for just one instrument, it wasn't worth the expense.
Second, I searched for SFz files. Both searches took a few hours, but I found one that just had a concert flute (Cambridge). I tried that and there was a world of difference over what I had. I am quite happy now.
What do I plan to do? Although I am now fond of Rock, country, bluegrass, jazz, spiritual and other genres, I grew up as a classical musician (Bassoon was main, plus other winds). I played in orchestras and ensembles a lot. Very satisfying. The pieces I am now collecting into MC5 are mostly quintets (Piano, oboe, clarinet, french horn and bassoon or a flute part instead of the piano. My intent was to have these all written out, then mute the bassoon part and play along with the rest to start practicing again.
Thanks so much for all your help. Will look into the software that you have recommended in case I branch out into something larger one day.
Best Regards