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If you're looking for a way to automatically track your jumps, and you have a smartphone with a pressure transducer, there's probably a free altimeter application for your phone that you can use. Such a setup only requires that you take your phone with you, which I do anyway in case I land out.
As for my experience, I find Altidroid useful for double-checking my exit and deployment altitudes. I haven't tested its function as an audible altimeter.
That said, I wouldn't rely on any device not designed as a skydiving altimeter for altitude awareness during a jump. An altimeter has only one function, but that function is critical to my safety as well as the safety of others on the load, so it's worth spending that money.