I did a small grouping of songs in both, then asked a few people to weigh in. Some who had no interest in surround and some who have been into it for nearly as long as I (going on 50 years). Some had decoders, only 1 had a SM. I'm a 4.0 guy, but I mixed the discrete files in a combination of 5.0, 4.0 and 5.1 as the material seemed to call for it. There are a good deal more variables I used in testing, but the outcome was 11 to 4 preferred the fixed setting, of the 4, 3 preferred the smart, and 1 wanted to know if I was providing lunch.Since you already have a way to QS encode as in previous broadcasts.... why would you have an Involve encoder board and not use it in the smart mode?
Oddly, they all agreed that the better surround effect when listening through stereo headphones, was with the fixed setting.
You see, I actually put over 100 hours of work into this 3 hour show .and. I ended up having to buy lunch!