Several months ago I had the same question.
I have burned thousands of Flac files from Nugs.com.
I use CD Burner XP on my PC the results very good.
In most cases there live shows in Flac will spoil you.
My CDT3 MK3 runs the tubulus concentus i2s cable into
A Terminator Dac. Best upgrade Iv'e ever made.
Dave