I am trying to use the Choir Unison instrument from Orchestral Colors in a backing track I am making for I Believe in Father Christmas without any luck. I am running Kontakt version 5.6.5 and the other instruments loaded seem to play fine.
 
I did have an issue with Pettinghouse Acoustic guitar which seemed to lose polyphony when the other instruments were playing so I gave it an instance of Kontakt to itself which seemed to cure the problem. I tried the same thing with Orchestral Colors Choir Unison but it made no difference. After loading it plays ok initially from a MIDI controller but as soon as I fire MIDI at it from a track there is no output. After stopping the track there is no output when played via a MIDI controller either. I can see MIDI arriving at the instrument on its display just no sound coming out.
 
It seems similar to the issue I had with EW Hollywood Orchestra which was cured by disabling "Zero controllers when play stops". However this is already disabled so it must be something else.
 
Any ideas?
 
Thanks
ZT
P.S. I have a pretty powerful PC with 16Gb RAM and all Kontakt Instruments installed on an SSD.

With some of the East West instruments expression is controlled via the mod wheel on the keyboard. Reset to zero = no volume. You need to insert a mod value >0 at the start of your track, maybe it could be the same issue?

Also, do you have an expression pedal connected to your keyboard, if so make sure its in the correct position, this was one of my great "dho" moments when troubleshooting a similar problem.

Thanks a lot Glyn! You got it in one :D
 
As soon as I connected my h/w controller and moved the mod wheel I could hear the instrument. As you suggest I will insert a MOD value at the start of the track then it shouldn't matter if the controller is connected or not.
 
Thanks again, I was pulling my hair out (and there's not much left as it is).
 
ZT

Here's a CAL script that inserts a MOD wheel (CC1) and a CC11 event at the start of a MIDI track.  Select the MIDI track and run the script.
 
 

;; InsertEWPlayReset
;;
;; Add a CC1 to 127 and a CC11 to 127 at the start of a selected MIDI track
;; to reset EW Play instruments
(do
 (include "need20.cal") ; Require version 2.0 or higher of CAL

 (insert 0 0 CONTROL 1 127)
 (insert 0 0 CONTROL 11 127)

)

Very cool, thanks for that msorrels. I will mark it helpful when I am on my PC again {edit: done}.

Cheers and Happy New Year to you both!
ZT
{edit: it works great, thanks msorrels}