What mac app will allow "direct editing" of an mp3 w/o recompressing?

the issue is that I'm using a low quality (poor mic) low resolution file (32kbps--which for lectures is doable) and need to edit it significantly. i have previously tried soundtrack pro 2, converting it to aif, editing, tried some processing to see if I could improve listenability, with some success... but when it is compressed back to mp3 at a reasonable resolution for download(these clips are 45mins plus in length), it introduces a lot of unwanted noise. even with all processing removed, leaving me with the original upconverted/edited file to recompress, I'm still unhappy with the results. so I figured I should find a program that would allow me to directly edit the mp3 file and then save out the changes. after googling, I thought Audacity might do this, but no advantage over STP.
apparently, windows has mp3cut and linux has WINE... if there a mac equivalent.

i'm short on time, but basically the problem is not that simple. converting a low quality/low resolution to AIFF will give you the same quality of sound as the original low quality file. once you begin editing the file it will require recompression to go back to mp3. recompression can retain the same listening quality provided you keep the resolution high enough, which then results in a much larger file. these files are long (45+ mins each) which make them larger than wanted. by being able to edit the mp3 directly, it doesn't require recompression, it simply removes the unwanted data and keeps the unedited data the same. it would be like using an mp3 splitter application, only you are making many edits. i can see this as doable and mp3trimmer might work if i can get it to show the waveform large enough to do the edits. I'm told there is a PC version which i am going to try, just to see if it will do the editing that i need to do, in which case I will be loading windows on my machine.

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