i read about mp3wrap but it turns out its a whole different format, and it only comes as a command line utility. i have no experience with command line lol

mp3val seems to be a validation tool ONLY.
mp3repacker seems to actually repack the data which means transcoding.
i meant, can i take a 128 kbps, 192 kbps, and high VBR mp3 file and combine all 3 files into 1 long mp3 file? why would this not be possible? if you can have VBR in a single mp3 file, why not be able to add CBR mp3 files without transcoding?
i use mp3direct cut for my editing and i love it. i read there was a feature to combine other mp3 files, but after searching for 10 minutes i still cannot find the option of combining 2 or more mp3 files with mp3direct cut. how can i combine mp3 files with mp3 direct cut?
thanks for your suggestions! can anyone tell me how to combine multiple mp3 files with the program mp3 direct cut?
thanks!!!