Depending on how many notes you’re playing, or the overall processing capability of your iPad, the sound may be interrupted due to high CPU usage. If this occurs, go to iOS' Settings > "Module" > "Audio Latency”, and try changing the latency setting to "1024".
Please refer to "Devices and Approximate Polyphony" on the product page.
KORG module for ipad sucks! iPad2 has very slow CPU and this application KORG Module works bad on iPad2. I have loud noise, squeak and clicks. Also I have a huge delay between a keyboard pushing and sound.