About the tuning

Some samples are a few cents off from the Equal Temperament scale that
keyboards use, but it's intentional.  I played the marching band horn (MBH)
myself and I've retuned those that were too far off, but even when retuning
I left some a few cents off.  In my opinion it's more natural as horn players
by themselves (as singers and string players) don't play in the Equal Temperament scale.

Also those few cents off give warmth and richness to the sounds.  When you have a
brass section playing the same note, no two players are exactly on the same pitch
and the bigger the section, the bigger the differences.

So, IMHO, this is not a limitation, it's an asset.