Audio Options for Recording
audio recording and file-sharing for language fluency
Vocaroo Audio Recording
How to use Voicethread
Hokusai Preview
Audio Memos 2 Tutorial - The iPhone voice recording app
Mic Notes is a Chrome Extension
MicNotes is a Chrome extension that allows for recording and sharing audio.
Google Drive Audio File Option: See below
Configuring Google Drive to Play Audio Files Natively
Another idea...
Recording audio and making a QR code might be an easy way for students to share their recordings via a Google Form short-cutted on each iPad.