Gliss is a new sound application which lets you play sound files and mix them easily by drawing on your iPhone. You can get it from Apple's iTunes store

With gliss you can load your sounds and draw them on the gliss sequencer in a quick, intuitive way that lets you make music on the fly. Play your mix using a tempo or scrub through by tilting your iPhone. The agility of gliss allows you to improvise and perform using the iPhone as a controller and interface.
Launch gliss and experience an hybrid of a sequencer, a game, an instrument and a generative music system. Put sound under your fingertips with 5 different colors to draw notes, sequences and sounds. List of features:

• 5 colors to draw different sounds / samples / voices
• sample upload via wifi
• sample playback in different pitches using various scales
• physical tilt-controlled playhead, which adapts movements of the hand
• physical randomization option: control random pitches with the phone's tilt
• muting voices
• glissandi over several octaves
• free or grid enabled placement of notes
• drifting selections
• saving / opening of projects
• have your background track running in iTunes while playing

Coming up in version 1.2:

• Sample Sets: A new instrument, which takes a list of samples and puts them on the y axis. So instead of controlling the frequency, multiple samples can be played by one colour. This can be used to create beats and rhythms, because you can have one drum set on one colour. Currently samples are played back in full length, although they are represented only by one dot.
• New Scheduler. Probably the most drastic change in gliss. The new scheduler is much more accurate and makes it possible to set the tempo by BPM and different types of meters.
• Back to original sequence. With a double tap on the randomization button, you can restore the original sequence. In a similar way you can get back to a default tempo, which can be set in the preferences, by double tapping the tempo button.
• Recording. You can now record your perfromance. Double tap on the playback mode button to start recording.
• Sequence organisation. Tap on the sequence number and you get a table with all sequences of the project. Here you can also change the position of a sequence, duplicate or delete it.
• Change direction but keep tempo. When you lock the tempo, you can now still change the direction.
• Slightly re-designed user interface.
• Upload zip files of samples.