Mic Tester

Mic Tester appears to be a factory testing app for the DS microphone and speakers. As of writing this, there are two known versions of Mic Tester.

2007/05/07 (v4):

This version uses a UI similar to that of NTR Aging/Nitro EVA. It comes with 4 major tests:
- SOUND, Plays some simple sound effects and music to test the speakers
- MIC, A few microphone tests. One is the SAMPLING DATA GRAPH, which displays a real time graph of the mic input.
- MIC CHECKER, Appears to be another microphone test, though it's impossible to use as it requires special factory hardware
- SPEAKER TESTER, Plays a tone in the left and right speakers to make sure they're working

This also comes with the standard NTR Aging tests like:
- Reception
- COMM TEST
- Port Checker
- ROM HEADER, Display cartridge header info

2008/12/01:

This later version has had nearly feature stripped, with the exception of SPEAKER TESTER. It does not have the NTR Aging styled menu or any of the tests mentioned above.