This app is a dedicated SoundFont player. This is kind of awesome for SoundFont hackers, but without an App to make SoundFont files on iOS you are limited to whatever you import from other sources. There are a ton of free SoundFonts out there, so you have plenty options there. If you are not into SoundFonts and Samplers there are better and easier ways of making sounds on your iPad. The version 1.4 update has added Virtual MIDI support, greatly extending the usefulness of this app, as it could be used with apps like Genome or SoundPrism Pro.