Here you find additional sound banks, which you can load into Infinite.
To achieve this, open this page in your iPad (Safari browser), and tap on the link. You will be directly connected to Infinite.
smk II - by Markus Stadelmann
A bundle with very nice sounds and a lot of interesting resources (25 Mb) from Markus Stadelmann.
Markus also made a video to demonstrate his sounds.