Compression Quality? Settings for Bitrate?

So, as I'm using this now (versus previous uses) it seems to be 'muddying' the audio some when I download the file.  Like it sounds great, and exactly the way I want it one the website app.

But when I download it, I get a somewhat noticeably lower quality audio file.
Yes, there is a difference between the v1 and v2 output as well I've noticed.  I just tested v1/v2 output with the same 256kbps mp3 file.  both spit me out roughly the same size, filetype, and bitrate, with slight audio differences.

Is there a way, that I can't seem to find, to alter the output Bitrate?  The files all seem to be 63/64 kbps now.  I have some previous ones where it was 96 on output, which sound basically identical to the cleanup done in the website.  But I can't get it to output that for me now (and probably for months, was just trusting for a few months, but I can tell a difference now)

But, right before posting this I also did a 48k hz, 24bit wav file, to test this out with.
I still can't set anything for the bitrate or file type, but I do get a much better quality file in return when using a very large wav file.  I ended up with a 55mb file, that was 10 mins long, still in wav format, and 768kbps.

I guess now I'm ultimately wondering now if there is something I can find to tell me where I can change the settings for output?  And if not, is there a 'rough' conversion chart so I know what the 'max file spec' file I can feed into this is, and what the expected output will be ?