Jeff explained over in a post on KVR.
"The solo violin I posted (Kake) is half-modeled. I didn't like the original bow sound. It was too low-pitched and brought out too many dissonant harmonics. Via lots of noise reduction algorithms and filtering/phasing, I removed the original bow sound. Then for each sample, I modeled a new bow sound with higher noise frequencies, and more harmonics related to the fundamental pitch. I also thought the violin itself had too nasal and harsh a tone. So I also modeled a violin with more of the fundamental pitch and even harmonics. By mixing the two modeled samples with the real violin sample, I created an instrument that had the characteristics I liked of the original, but with a deeper, richer, and smoother tone.
In fact, about 1/3 of the musicians in the No Budget Orchestra ensembles aren't real. They're modeled. (The other musicians in an ensemble come from a sophisticated process of "stacking" multiple notes of the one or two solo instruments, giving the illusion of multiple musicians)."
If you click on the strings or brass headings below, you get all the instruments in that section in a single zip file.
Solo Violin - LDK Solo Violin - Kake Violin Section Solo Viola
Solo Cello - BWV Cello Section Double Bass - DS Double Bass Section
No Budget Brass
Solo Trumpet Trumpet Section Solo Horn Horn Section
Solo Trombone Trombone Section Solo Tuba Tuba Section
Solo Cello - BWV Cello Section Double Bass - DS Double Bass Section
No Budget Brass
Solo Trumpet Trumpet Section Solo Horn Horn Section
Solo Trombone Trombone Section Solo Tuba Tuba Section
All instruments are Creative Commons Attribution : Jeff Glatt.
Also Solo Violin - LDK: LDK1609@freesound.org
Solo Violin - Kake: Kake 85
Solo Cello - BWV: Bwv66
Double Bass - DS: Drogomir Smolken and Ludwik Zamenhof
Solo Trumpet Mute Samples: Mihai Sorohan
Solo Flute - Alm: almudenagonzalezflute_8
Pan Flute: Timohanes
Recorder: Samulis
Solo Violin - Kake: Kake 85
Solo Cello - BWV: Bwv66
Double Bass - DS: Drogomir Smolken and Ludwik Zamenhof
Solo Trumpet Mute Samples: Mihai Sorohan
Solo Flute - Alm: almudenagonzalezflute_8
Pan Flute: Timohanes
Recorder: Samulis
These instruments use the WIPS scripts by the late, great Kontakt scripter Robert D. Villwock