SAMPL is a free app that simply allows you to play your own sounds from a customizable button interface. Sound files can be easily added to the app via iTunes file sharing.
Main features;
• Easy to use, hardware-like user interface
• Customizable button assignment
• Switchable button labels
• Wooden side panels
Supported audio file formats/extensions:
• AAC (.m4a)
• MP3 (.mp3, obviously)
• AIFF (.aif, .aiff, .aifc)
• WAVE (.wav, .bwf)
• Core Audio Format (.caf)
SAMPL is available for FREE