Why you start with an MP3 file instead of a format that is uncompressed and lossless?
And more interesting... how do you modify the music? like, what you change in it?
Some of the most obscure music I enjoy cannot find is often obtainable through the MP3 format. Other sources of my personal CD collection I transfer to MP3 at 192k bit rate. The compression algorithm is also oddly useful when it comes to recording old CrO2 cassette tapes as well given the process itself removes unwanted tape noise.
The most common thing I do with all tracks is to give them one second of silence at the beginning, and two seconds at the end. Many sources have ridiculously lengthy amounts of silence and I like them to be uniform in this respect. On occasion I will also selectively modify the volume up or down depending on the track. And of course if there is any kind of momentary audio glitch I will edit it out so it sounds clean all the way through. I also occasionally alter both fade-ins and fade-outs to my liking.
I am just saying, if I was going to spend 3 hours fine tuning some audio files, I personally would prefer to work with better quality than MP3... maybe there is something I'm missing.
1) At my age (nearly 70) my range of hearing is not what it used to be when I would have considered myself an "audiophile" back in the 80s. Plus I have tinnitus now. So there's not much point in being pissy about audio recording in compressed formats versus uncompressed formats still at a much higher dynamic range than those of the analogue era I grew up in. (Vinyl records and cassette tapes).
I enjoy doing the work. But then I'm also retired. What may be "work" to you is "play" for me.
Also I can play MP3 files directly from a USB 3.0 port of my Roku device or my television. Though my Roku Media Player does not support uncompressed audio formats anyways. Besides, unlike having to handle physical media I like having access to my entire music collection with just a remote in my hand! Before MP3s, I never had that kind of convenience.
2) And
as a renter I cannot use my audio system to volumes I would like anyways. In as much as I like music, I also appreciate the silence from most of my neighbors. So I have to keep the volume down most of the time. Rather than be concerned about compressed sound, in fact I'm always trying to tinker around with ways of attenuating the bass, without subtracting too much from the dynamic range I do have after compression.
In essence being evicted by a corporate landlord would prove to be much more problematic than stewing over digitally compressed audio algorithms that still yielded decent signal-to-noise ratios compared to inferior types of analogue recording that I grew up with. That for me it's more a matter of perspective in enjoying "cleaner" digital sound than striving for dynamic range I cannot truly optimize at much lower volumes.