Need Help Understanding A Routing Scenario

[Warrior]

I need help understanding why this particular routing scenario is occurring.

I have an aggregate device set up that includes my Axe-FX being connected to my Mac via USB and a Focusrite Saffire Pro24 connected to my Mac via firewire.

When I create a track I select an Input: Stereo that is my Axe-FX's USB Left & Right.

My master output routing is Mon 1(Saffire) - Mon 2 (Saffire) - Stereo

When I connect SPDIF from my Axe to my Focusrite (So I can hear my Axe-FX without having to run Reaper) my master output routing automatically changes to Axe-FX Left & Right.

If I manually change the routing to Mon 1/Mon 2 I get a mono signal.

What the heck is happening?

 

[Musikron]

One interface per computer at a time. Just run it through the focusrite.

 

[Bakerman]

What action does "when I connect SPDIF" refer to? Plugging the SPDIF cable into Saffire? Adjusting Saffire clock source?

What signal is mono after this? Axe-FX signal, computer playback, both?

Have you verified SPDIF is set for monitoring as a stereo pair in MixControl, not two separate (centered) mono channels?

 

[unix-guy]

One interface per computer at a time. Just run it through the focusrite.

I don't believe that is true on Mac, which supports "aggregate" devices.

 

[Warrior]

What action does "when I connect SPDIF" refer to? Plugging the SPDIF cable into Saffire? Adjusting Saffire clock source?

Plugging the SPDIF cable into Safire.

What signal is mono after this? Axe-FX signal, computer playback, both?

Just playback

Have you verified SPDIF is set for monitoring as a stereo pair in MixControl, not two separate (centered) mono channels?

Hmmm... not sure.