Harold!! Get un-verklempt!!! I spent a whole lot of time last week with Izotope RX SRC'ing and downbitting a female vocal (light, bright-ish, breathy voice) with string section. I needed to take the track from 24 bit 48 k to 16 bit 44.1 k. I did this process with Barbabatch (my previous SRC of choice) and it did a good job (and was very quick & easy), but it increased the apparent volume of the vocal in the track by a little less than 1 dB; I'm pretty sure this effect occurred because it added a touch of top end 'buzz' that wasn't present in the original. Then I started trying to beat that result with Izotope. For me--and maybe it was because I was hyper-focused--there was a lot of variation in the results I got... it was a little maddening because I was being really critical about trying to create the exact sonic impression that the original mix gave. It felt like the two areas that things changed (depending on the parameters chosen) were 200-500 Hz and roughly 8 k and above. Cutting to the chase, I felt like I was able to beat the result I got from Barbabatch in the areas of naturalness, depth retention, detail retention and not incurring any additional [unwanted] brightness while retaining the character of the top end that was there. Neither processed file sounds just like the original, but I like the Izotope result better--although I had to work fairly hard to get it. The next question to be answered is whether my new default Izotope treatment will apply similarly to other projects or if I'll have to log in a fair amount of time yet again. But I think it's like playing an instrument: it will get better and faster with practice. YMMV.