A note to everyone still using the iPod Touch Microphones iVoice III or iVoice Pro with their 1st Gen iPod Touch.
Do not upgrade your firmware to 3.1.1 unless you are OK with losing the functionality of iVoice III or iVoice Pro microphone. We can confirm that these mics remain functional up to software version 3.0, but the 3.1.1 upgrade disables the mics.
If you have not upgraded, we recommend to hold off until 3.1.2, where Apple will probably issue a fix. If you have already upgraded, and the mic function is more important to you than the functions in the 3.1.1 upgrade, then you should roll back your firmware version.
We cannot offer any official support on how to roll back your iPod Touch firmware to 2.2.1, however there is a lot of information out on the web. Some good places to research are the Apple forums, particularly this post about rolling back firmware. (Even though it is outdated, the methods can point you in the right direction.)
Also you can check out the YouTube video below from “EMAC” regarding how to roll back 3.0/3.1.1 firmware back to 2.2.1 on iPod Touch:
Note that the iPod Touch 3.1 firmware upgrade DOES NOT affect mics plugged into the 3.5mm jack on iPod Touch 2g & 3G.
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Cheers! – TouchMic.com