How to create multiple ALT outputs in UAD Console with independent fader control. This gives you the ability to switch between 4 or more sets of speakers as the Master Output of your Apollo. Can be done with just your mouse, the I/O Matrix page and Console but this works especially well with the 3rd party UA Midi Control software made by Radu Antonio Varga.

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Basic premise: Whatever is assigned to I/O Matrix OUTPUTS 1 and 2 will always be considered your main output and any computer audio will always be routed to outputs 1/2. You can assign Virtual Channels to these outputs and then route those Virtual Channels to physical outputs in order to use those physical outputs for a 2nd, 3rd, 4th, etc... set of speakers (only limited by the number of Virtual Channels and Physical Outputs of your rig). The fader on that Virtual Channel works just like an independent Master Volume for those speakers!

For larger Apollo devices, routing the output of a Virtual Channel to a physical output can be done directly on the Channel level but for smaller devices (twin, x4) you can utilize the Cue Outputs and set their source to CUE and then set Mirror To Output as a pair of physical outputs. +

Put your X16 (or whatever device you want to utilize the physical analog outputs with your studio monitors) as your primary device and the X4 as the secondary. This is important if you want to have this many faders and still have access to the ins and outs of the X4 on your desk. This also gives you 2 extra outputs on the X4 (monitor outputs are not used and can be repurposed in your DAW - headphone amp, maybe?).

Change the I/O Matrix output 1&2 to any pairs of Virtual Outputs when you want to route the audio to a different set of Physical Outputs. Set the Virtual Channels to "link" on the Console and name that channel after the speakers youre going to send the audio to. Be sure to "Save As" your I/O Preset and name it with your routing scheme so it makes sense later on when you want to manually swap speakers with your mouse.

For X16 you can route those Virtual Outputs to Physical Outputs on the X16. The fader for that Virtual Channel controls the volume of the physical output.
For X4 you cannot route the Channel Faders of Virtual Channels to output to a Physical Output in the same manner as you can with the X16 so instead you have to utilize the Cue Fader on that Virtual Channel. Cue 3 and 4 are free to use since you are only using Cue 1 and 2 for headphones. Set that Cue to listen to its own Cue Source (and not the MIX Source) and then set the Mirror to Output to a pair of Physical Outputs on the X16. The Cue Fader in the Sends area of the Virtual Channel will control the volume of the Physical Outputs assigned to that Cue's Mirror to Output.+

With those audio routes saved as individual I/O Presets, you can now set up your MIDI controller with UA MIDI Control.

Set up your MIDI Controller with unique CC or Note values for each button/knob. Doesnt really matter what they are, so long as each one is unique. Set buttons to invoke each I/O Preset. Set faders to control volume output for each Physical Output.
This is the UA MIDI Control setup:

Paths for each parameter

I/O Presets:
Device = EXTRA (scroll all the way down to the bottom)
Section = I/O Presets
Click on one of your I/O Presets, click "Start" in the MIDI MAPPING section at the top of the GUI, press one of your MIDI buttons
Do this for all I/O Presets.

Master Monitor knob:
Device = x16
Channel = MONITOR
Section = Monitoring
Parameter = Volume
Use a slider (usually the one below the button you selected to load this I/O preset) with the "Start" button on MIDI MAPPING

Virtual Channels for the x16:
Device = x16
Channel = Virtual pair 1/2, 3/4, etc... (or if you named the Virtual channel, you will find that name here)
Section = Monitoring
Parameter = Volume
Use a slider (usually the one below the button you selected to load this I/O preset) with the "Start" button on MIDI MAPPING
Virtual Channels for the X4 (utilizing the unused Cue Source and Mirror To Output):
Device = x4
Channel = Virtual pair as described above
Section = Send - CUE (use the correct corresponding CUE)
Parameter = Gain
Use a slider (usually the one below the button you selected to load this I/O preset) with the "Start" button on MIDI MAPPING
Be sure to save your Preset on UA Midi Control (hit the little drop down arrow after the word "Preset" on the GUI).

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