OK, here goes...

Am working on a multi-track midi project, using Garritan GPO4, 64 bit. The nice thing about GPO is that, for each instance of ARIA, you can have up to 16 instruments, you can assign any midi channel to any instrument (including ones already used - useful for multi-instrument ensembles), and you can assign any one of 16 stereo audio channels to each instrument (including channels already used - you can bus one or more instruments to the same audio channel).

So I have pretty much close to a full orchestra, etc. 

Woodwind section setup - i.e.
    

• two Flutes                midi 1          audio 1/2
• two Oboes                midi 2          audio 3/4
• English horn              midi 3          audio 5/6
• two Bf Clarinets        midi 4          audio 7/8
• Bass Clarinet             midi 5          audio 7/8
• two Bassoons             midi 6         audio 9/10

All of these are using the same synth instance, ARIA 1, and are all placed in a track folder named Woodwinds (midi).

There are corresponding audio channel tracks for the above...

• Flutes                ARIA 1       1/2        Woodwinds (bus)          
• Oboes                ARIA 1      3/4        Woodwinds (bus)          
• English Horn      ARIA 1       5/6        Woodwinds (bus)                                        
• Clarinets            ARIA 1       7/8       Woodwinds (bus)            
• Bassoons            ARIA 1       9/10     Woodwinds (bus)          

The Woodwinds bus goes to a Master bus and from there to the mains.

It might seem like a lot of work, but having the separate audio outputs for different instrument groups allows for finer volume control than using midi volume.

Here's the payload you've been waiting for - 

If I SOLO the audio channel for the flutes, i.e., all of the instruments on the same synth instance get soloed. But wait - it get's better! Only the 'flutes' audio channel is soloed, but you can hear all of the instruments on the same synth AND they all move 'flutes' meter - they do not move their own meters.

Now, I don't know about you, but THAT AIN'T NATURAL....

ok that's a little odd even given aria player.  so i tried to recreate this with no luck. only thing i can come up with is that you're hitting exclusive solo on the flutes.  this WILL solo all the tracks because it's basically saying synth exclusive.  my suggestion is solo the midi tracks you want to listen to and see what kind of result you can get.  
or it's an x2 essential thing. not really sure.    

and nope that's not really a lot of work... a lot of work is writing a score and working with the players to get the articulations right - because everybody has an opinion (sometimes the advice is good and sometimes ugh). 

swamptooth


ok that's a little odd even given aria player.  so i tried to recreate this with no luck. only thing i can come up with is that you're hitting exclusive solo on the flutes.  this WILL solo all the tracks because it's basically saying synth exclusive.  my suggestion is solo the midi tracks you want to listen to and see what kind of result you can get.  
or it's an x2 essential thing. not really sure.    

and nope that's not really a lot of work... a lot of work is writing a score and working with the players to get the articulations right - because everybody has an opinion (sometimes the advice is good and sometimes ugh). 

A clue! 


I tried selecting a different audio channel other than the flutes - all worked perfectly and as expected. So... it appears that it's only happening when you solo the audio channel that is mapped to Aria outputs 1/2. Any of the other outputs soloed (by itself) works fine.


On a hunch - I tried this on the string section synth, a different instance of Aria. Same thing - soloing an Aria audio output track mapped to 1/2 acts as if the synth were a single channel version. Of course, I am using the multi-out version of Aria...go figure...

Only thing left to do is try a different synth with multiple output and see if it behaves the same. Not a show-stopper here, this issue, just an annoyance..

dunno.soloing 1/2 in aria works fine here but NOT  exclusive soloing. odd.