I am downsampling a sound file to reduce the file size. Converted from 44100k/32bit to 16000k/8bit.
After downsampling the file developed a hiss. I used the Hiss Reduction process and it sounds great in Audition, but when I save the file and close it, then open it back up, the hiss is back.
You developed a hiss because you dropped the sample bit depth to 8 bits, and that's what determines the noise floor. 6.02 dB/bit = about 48dB maximum depth = slightly worse than an old cassette recorder, and on a par with a phone call. This is determined by the Laws of Physics.