Neat concept, but I'm thinking that the development time in this would be lengthy... you'd need to discover an API for sound, and be able to tap into it's volume levels to trigger data recording. Most code samples I see from a quick search are around clicking a button to turn recording on, not monitoring the mic for certain audio levels.
I'm sure that it probably could be done, but honestly, it's going to take a LOT of work to make it happen. Depending on the hardware you have it may also cost as well...
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