I recorded sound (speach) elements for a number of slides.
The sound quality was good.
Than I added background music from a Macromedia sample file
(Loop Acoustic Mellow.mp3). The sound quality of my oral
explanations dropped dramatically. I removed the background music.
But quality level remained the same and I cannot go back to the
initial level. Is this a common phenomenon? Should I rerecord the
You need to watch closely - a) recording resolution (sonds
fine if you are happy with it), b) resolution of background
(included loops are lower resolution mp3; you can import better),
and most importanly c) resolution for final output.
It may be that your narration audio is reduced to the same
resolution of the background audio (or worse?) and then you're
wondering why it happened. The presence of the background loop is
not the issue. I've experimented with this.
Hopefully you can go back to the original project and render
it again, watching the audio output spec. To keep file size down,
tons of audio can get thrown away. This is okay to a point; make
sure you haven't drifted down to 8 bit resolution which is
unacceptable. Have done tons of work at 11K sample rate mono 16