Thanks Fig...
But I have done some "studying" of the Hear Back system over the last day or so, and I think you have a couple of misconceptions with the current implentaion of the product. I am not sure if there was an older version or not, but the current one is am bit different than your description.
First, there are 6 mono channels and one stereo channel on the system for a total of 8 channels. I am thinking:
1) Studio L
2) Studio R
3) Drum mix
4) Bass
5) Guitar mix
6) Vocal mix
7) talk back
8 ) click track
Whent there are other instruments, such as keys, for example, I will need to modify that list a bit...
Secondly, it does not use ADAT cable to connect the units, it uses Cat5e cable, in a similar way to the Aviom units. The hub will accept ADAT input as well as analog (and a proprietary digital format for daisy-chaining).
We use an Aviom unit in our live rig, but I did not have to pay for that one! I just supply my earbuds, and I am good to go!
For my own studio however, I am thinking that I would like to save a bit of money over the Aviom systems, and yet not be as restricted as on the Furmans.
I will take a closer look at the Mytek units...although I am sure they are pricy as well.
Thanks!