I have three instruments loaded in a single iteration of Kontakt. They are on separate midi tracks. When I solo one track in the DAW, the solo button lights on all tracks which means I can't solo any track. Any ideas? I thought that may happen when muting tracks as well but it doesn't. Each track can be muted without affecting the other tracks. 

It visually looks like this (i.e. you solo one Kontakt MIDI track and all Kontakt audio tracks get soloed, too ... you solo one Kontakt audio track and all Kontakt MIDI tracks get soloed, too), but what you hear is correct, meaning either soloing MIDI drums or audio track to where Kontakt drums are routed to will give you only the drums and mute the rest of the Kontakt instance.
 
I would assume this is because Sonar cannot know anything about the internal Kontakt routing; virtually any MIDI track could be routed to any Kontakt audio track so above behaviour seems to be the logical consequence.

Rob[atSound-Rehab]
... but what you hear is correct, meaning either soloing MIDI drums or audio track to where Kontakt drums are routed to will give you only the drums and mute the rest of the Kontakt instance.
 

Thank you for the advice, Rob. That is the trouble. If I solo one track, all tracks play. In effect, soloing makes no difference to the overall audio output. Each midi track is on a different midi channel and each audio track is on its own stereo output pair.

Ruckman65

Rob[atSound-Rehab]
... but what you hear is correct, meaning either soloing MIDI drums or audio track to where Kontakt drums are routed to will give you only the drums and mute the rest of the Kontakt instance.
 

Thank you for the advice, Rob. That is the trouble. If I solo one track, all tracks play. In effect, soloing makes no difference to the overall audio output. Each midi track is on a different midi channel and each audio track is on its own stereo output pair.

You have probably done this 3 times but ... double-check the routing inside Kontakt, double check your Sonar sends (pre/post) and aux tracks (if there are any) and if all that seems ok, try to quickly test that in a new project with simple Kontakt only setup (maybe something got corrupted in that other project)

Try this solution, from abacab in a similar situation.

"First check that you only have "Input Echo = On" for the desired tracks in the track view that you want to hear. If you have more than one track selected for Input Echo, you will hear a layered sound from the associated soft synths."

That's bizarre. Are you soloing the MIDI tracks or the audio tracks?

I have double and triple checked the routing in both Kontakt and Sonar. Input echo=on is only on for the track in focus.
I have soloed both the midi tracks and audio tracks with the same result. Really is weird!  

I'd guess a corrupted project file.
Does it do it on all projects?
 
Try starting a project from scratch and test it.

Hey Steve. Yes, it does it on all new projects as well so I guess we can discount a corrupted project file.

I LITERALLY just checked in a current Sonar Platinum project I am working on, which has a single Kontakt instance that has Piano, Brass, and Strings loaded up, each on their own midi channel, AND each routed to their own output channels in Kontakt.
 
There are additional synths loaded into the project, but they do not factor into this situation.
 
I just literally went through and soloed the Piano midi track, while the Piano midi track was in focus, with its midi input echo ON, and the Strings midi input echo was ALSO on.
 
While the Solo buttons all turned green for the audio tracks that connected to that Kontakt instance, and the Solo button for the Piano midi track was also on, ONLY Piano is heard when I trigger notes from my midi controller.
 
If I take the Solo OFF of the Piano midi track, and trigger notes, I hear both Piano and Strings, as expected.
 
So if you are doing the above and NOT getting the same kinds of results, then I do not understand how you have things set up and routed.
 
I work daily with Kontakt instruments within sometimes 4 or 5 or more Kontakt instances for any given project of mine, and I do NOT have the issues you report.  YES, it lights up all of the solo lights on the audio tracks for any instrument loaded into that particular Kontakt instance, however, I only hear the correct instrument's sounds while playing.
 
Obviously what you are experiencing IS real - I just don't know how you are having the issues - meaning I just don't understand what could produce those issues.
 
Bob Bone