I'm working on a reading along book. And I've been having a lot of troubles recording the narration.
The book has 26 pages each one is around 1 minute. The problem is the size of the final files and quality.
I've recorded in Audacity and Garageband, (to compare sound quality). Later I exported the files to .m4a
Up to here the voice narration sounds good.
But when I add the recordings .m4a to the app, the narration in my app (iPad) sounds very bad. Same narration in mp3 format sounds good in the app, but I know I shouldn't use mp3.
I've been playing with the settings, 32Kb-11Khz, 64Kb-22KHz, 128Kb-22KHz, 128-Kb-44KHz, all combinations with Variable Bit Rate, Constant Rate, Average Rate, Optimize for voice, etc.
Some files sound good, but different files with same settings sound really bad.