If the microphone on your iPod touch isn't working
Mini Capsule Microphone for iPhone 3G / iPod Touch 2G / iPod Nano 4G
iRig Mic [iPhone/iPod touch/iPad対応 コンデンサー・マイクロフォン] IKM-OT-000007C|の通販はソフマップ[sofmap]
Zoom Iq7 Ms Stereo Microphone For Iphone/ipad/ipod Touch : Target
Amazon.com: Professional Lavalier Lapel Clip on Microphone, Lapel Condenser Mic for iPhone, iPad, iPod Touch, Samsung Android and Windows Smartphones, YouTube, Karaoke, Studio, Noise Cancelling Microphone : Musical Instruments