I have e-mail notification of voicemails setup on my UC520 and have everything set so that the vm message gets attached to the e-mail as a .wav file. However, the volume is very low, such that I can only make out what is said if I crank the volume all the way up on a computer. I can't make out anything when I try to listen to them on a smartphone. Is there a way to adjust the volume that the .wav files are recorded at?
On top of what Marcos has said, i would strongly encourage you to look at doing only incremental updates. Depending on your carrier the smallest movement in the gain can have a pretty big increase, to the point where the voice becomes overly loud and at times distorted.
I would suggest that you look at doing a few tests first before you go commercial with it.
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