If you would like to turn your older iPod, iPhone or iPad into a high-end recording device check out the Tascam (TAIM2) iM2 Stereo Microphone for Apple iOS. When it was first launched the retail price was $99.99. However, since Apple has now switched to the lightning connector, the price has dropped significantly for Tascam iM2 Stereo Microphone for Apple iOS Products (White) B&H Audio to $23.95.
I am a long-time user of Tascam recording devices. When we researched how to create compelling audio of class room lessons for iTunes and Amazon distribution, we decided on the the original Tascam DR-1. We have since upgraded to the DR-100MKII. This microphone turns an iPod Touch 4th Generation, iPhone 4/4s or iPad(1/2) into a Tascam recorder. It comes with Tascam software for uploading the files to a computer where you can edit them.