I've never seen any documentation about how to use the "Voice Memo" button, but it behaves like another hard key. While the hard keys produce key events 0x0204, 0x0205, 0x0206, and 0x0207, the "Voice Memo" key produces 0x0214. The "Voice Memo" key only appears in conjunction with the 5-way navigator, so perhaps that would be an adequate test. I'm not sure about the Tungsten/W - does it have the key?
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