I assume you mean using the playbacks with an individual channel assigned ?. With Insight a sub is still a sub, but maybe with a single channel assigned, which essentially makes it a channel fader as on the Express.
The Eos manual and data sheet states that the 10 on-board motorized faders, and I assume the 40 on the playback wing, can be faders/playbacks, submasters, masters and grand masters. The manual states that a submaster can control channels, incluiung individual channels.
I going to assume that this is going to carry over to the Ion, which has the ability for upwards of 240 submasters via the playback wings. I'm assuning that the playback faders are just that, not simply a sub.
I'm looking forward to the release.
Wow, that thing is puny. I mean, granted it's pretty much all the programming/playback buttons and encoders of a fairly powerful board without faders, and it's designed to be cheap, but I can't help looking at it and thinking it's almost uncomfortably small.