I can't believe the Cakewalk TTS-1 has been completely overlooked in this thread for those signature Roland pop horn section sounds. These horn sounds have been burned into our brains for decades now on countless hit records.
It's certainly worth a try, being you already own it, and I've found it to work quite well in tandem with Dimension Pro's many sampled horn patches spread out and over between several expansion packs.
Garritan Pocket Orchestra developed by Digital Sound Factory is nice, but as nice as it is, that was only included free with Dim Pro as a carrot waved in our face to encourage us go visit DSF"s website and discover gold. And at really reasonable and affordable prices.
And all Dim Pro patches, voices, and samples work flawlessly with Rapture Session and Pro.
VEERRRY Nicely!
But don't discount TTS-1 by any measure because it's an old discontinued DXi synth or simply by other's opinions, at it's heart lies a genuine Roland Sound Canvas engine and with many selectable "version" releases throughout the years. And despite many user's opinions I've read and heard about over the years their are some Sound Canvas patches I would NOT want to live without.
you can assign up to 4 parts of separate audio outputs per instance, although I highly recommend opening a separate instance of TTS-1 for each ensemble patch or individual part for optimum sound quality and control using the right EQ and reverb audio plugins.
BIG emphasis on the right EQ and reverb/Room settings, and HUGE emphasis on getting the octave ranges right.
Not a problem with sampled horns which typically can't and won't play out of their octave ranges.
The TTS-1 does not play samples and will exceed an instrument's natural octave range which is very cool for creating new sounds to your canvas, but not so much at all for authentic sounding instruments.
You can get surprisingly good authentic sounding "Pop" horns section with TTS-1 "Providing" you do not play/perform any part(s) out of any of the individual horn's natural octave range.