I wanted to tell everyone about a new app that I believe will help the accuracy of your horn players. I have NO financial interest.
Farkas 2.0 is available for Iphone $3.99 and will soon be available for Android.
One of the pages of the Art of Horn Playing contains measures of isolated pitches to work on 1st note accuracy. This app takes the same approach but in a fun way. You can adjust the range and the tempo. The BLITZ level is even fun for me - the tempo increases with each note played and gets into B# double #'s and bass clef.
I hope this doesn't violate any yellow Board rules but it's something that will make your horn players more confident.