Made under the label MoMinstruments (named after founders Mouse On Mars), fluXpad is a sampler and sequencer that lets you create sequences by drawing on the iPad.
The app has also gained high-profile devotees such as Justin Vernon (Bon Iver). We see how easy it is to make a sequence in this video.
MoMinstruments costs around €9 and is available now in the App Store. More information at mominstruments.com.