I have .aup recording of voice that has fairly decent quality.
When I export to MP3, it sounds like I recorded it inside a pipe. Kind of a hollow or flute-like effect.
What settings should I use to minimize this effect when creating an MP3?
IMO If the track is stereo then use an mp3 bit-rate [“quality”] of 256Kbps or the maximum which is 320kbps …
http://manual.audacityteam.org/o/man/mp3_export_options.html
If the track is mono , or the sample rate is below 44100Hz, then you can get away with less than 256kbps.