Loading your own sounds is a feature included in the Samplodica Pro upgrade, available as an in-app purchase at $1.99.
To load your own sounds, they need to be in:
* .wav file format
* less than 3 seconds long
* mono
* 16 bit
* 44.1 kHz
To make four sounds into one sound pack, name the files:
My sounds_1.wav
My sounds_2.wav
My sounds_3.wav
My sounds_4.wav
When read by Samplodica, those four sounds will make up a sound pack called “My sounds”. Replace “My sounds” with whatever title you want to give your sound pack. Add the files through iTunes File Sharing.
For more on iTunes File Sharing: http://support.apple.com/kb/HT4094