Hello
I think the External Insert plugin is due for a much needed update to fix its behavior. As of now, and since it was released, it is forcing stereo outputs, and if you choose a mono output, it hijacks the second mono output of whatever pair you selected first. Even if you set interleave to mono, External Insert will remain in stereo.
To test it, do the following:
-Create an audio track, instantiate an External Insert plugin.
-Set SEND of External Plugin to a mono output, lets say "Left USB Audio Analogue 3".
-Set RETURN to a mono input, lets say "Left USB Audio Analogue 3". (pic 1)
-Create a second audio track, instantiate a second External Insert Plugin.
-Now, if you try to set the SEND to the second mono output "Right USB Audio Analogue 3", it just doesn´t show up, it just doesn´t exist. (pic 2)
-Even more: now create a third track, and try to set it´s output to "Right USB Audio Analogue 3". Again, it doesn´t show up, as the External Insert just "ate up" the whole stereo pair.
This is in fact reducing the interface I/O capabilities to half!
And the sad thing, it has been like these for ever, it has never been updated since the feature was introduced at least since Sonar 7 (before the Sonar X days).
It is sad too because Cakewalk was (as with so many things) one of the first daws to develop this feature, but it has been left behind. I have seen posts in the old forum about this that were never taken into account, never addressed by the developers with even a mild response. Not to mention the matter of not being able to solo buses with external insert, that also keeps getting mentioned now and again without response.
Contemporary developers should take a look at how Reaper or StudioOne have implemented this. StudioOne´s implementation is closer to what CBB´s should be, in my opinion, and for shure it can be done better. Check these videos, one of them from 5 years ago!:
https://www.youtube.com/watch?v=q_gweD57AQk
https://www.youtube.com/watch?v=G4dZwNSeZM4
Love Cakewalk, have been using it for more than twenty years, but this feature alone has had me thinking about moving to Reaper. It just can´t be taken seriously for hybrid mixing if my ten I/O interface is rendered half useless and can´t use all my hardware only because the daw´s archaic implementation of this feature.
Please Bandlab folks, keep up the great work you have been doing, and take action to fix this long forgotten feature. I know I´m not the only one asking, as there are other posts about the subject.
Thanks!