Does up-res'ing really improve the sound if the source is mp3 or AAC?

[GeoPaas]

If my source file is of a lower quality, even though it's digital ...

I'm definitely new around here, and I've immersed myself into the world of digital audio. After 25 years of excellent service, I retired my old hifi and bought into the integrated-amp-plus-streamer world of relatively...

[aj4value]

Reading the description there was a lot of info about MP3 conversions... I have Flac files I want to use on my MAC music server -- will this program work for me?

Thank you