For those still using analogue or digital phone systems, voice on ISDN circuits has a bandwidth of around 4000Hz. The audio from an analogue phone is sampled at 8000Hz, and because of the nyquist theorem, must be low-pass filtered to 4000Hz. So any frequencies in the audio beyond 4000Hz are lost. Interestingly, the human ear and mind are good at recognising human speech, so this is considered "toll-quality" voice, i.e. good enough to pay for. This is the reason why certain vocalised letters are difficult or impossible to tell apart on the phone. For example, the differences between B, P, T, C, etc. are almost entirely above 4000Hz.
2 days after ordering my Grace Message Player, it came from Amazon in perfect condition (I got prime yo!). I plugged the power cord in, and plugged the male thingy into the Grace thingy, and bam, we have had on hold music ever since. After a few minutes of music, they have a male voice come on explaining that we care but we are busy...we have not forgotten you etc etc, and then some more music, and then a female voice saying basically the same thing. I guess I could load an mp3 with some sales stuff on it, but I kind of like the neutural message that they already had on the machine. I am sooo glad I got this thing. Highly recommended. If you don't like it or it does not work, I bet Amazon would take it back, too.

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Messages On Hold is a fantastic company, quick turn around time and very easy to deal with. Thank you!