You might remember Simon Cann's book on iPads synths that was released quite a while back now.  Well, on the 1st of November he's got some new books coming to iBooks on synths, and the video gives you a taste of what they're about. 

I'm not sure if I saw this when it first came out, but even if I did it is free at the moment and worth a look.  Here's all about iPhase:

!!!!!!! FREE FOR A LIMITED TIME!!!!!!!!!!!! 
iPhase is a generative music application made by Mikael Holmqvist. 

Create amazing beats and melodies with the swipe of your fingers and watch it bounce back and forth on the iPhase grid.  Choose from 5 different instruments and drum kits and 14 different musical scales. 

Make sure to use loudspeakers or headphones for best possible sound quality! 

NEW IN iPHASE 2.0

Make more complex and better sounding beats with "bounceEdges"

Save/Load function

SHARE your beats to the iPhase Community and listen/play along/vote for others. 

Play iPhase arcade modes

INSTRUCTIONS/DETAILS

SWIPE in any direction to create a TONE.  Tones are higher towards the top and right side of the grid.  The tones will move on the grid in the swipe direction and continue bouncing between the edges of the grid and the start position of the tone.  Every grid edge have its own instrument and you can change the setup whenever you want using the instrument buttons. 

TAP the grid to create a BOUNCE EDGE.  When a tone hit a bounce edge, it will turn 90 degrees and change instrument.  Tap again to change the orientation of the bounce edge and tap a third time to remove the bounce edge from the grid. 

The tones are arranged in PENTATONIC MUSICAL SCALES which makes every swipe sound good.  You can change the scales choosing from a total of 14 major and minor scales - the possibilities are endless! 

Use the PLAY/PAUSE BUTTON to pause your beat.  Tones can still be created in pause mode and this can be used to make your beat more precise. 

Use the LOOP MODE TOGGLE BUTTON to switch loop mode on and off.  This can be used to first create a cool beat in loop mode and then switch it off to start playing some melody to your beat. 

SHAKE your device to create a RANDOM BEAT.  Good when you run out of ideas and want some inspiration from chance. 

SAVE your beats with the SAVE BUTTON.  They will then be found in "my saved beats" on the main menu. 

THE iPHASE COMMUNITY
One of the biggest new features of iPhase 2.0 is the iPhase Community.  Share your beats to the community and listen to (and play along with) others.  There is also a rating system and you can vote for beats on a scale from 1-5. 

ARCADE- and ∏ MODE

There are 2 new arcade modes available in iPhase 2.0.  Standard arcade mode is a memory game ála "Simon Says". 

The second arcade mode is called π-mode and is not unlocked until you score 30 points or more in arcade mode. 

TOP 10 high scores from both arcade modes will be shown in the iPhase Community! 

ENJOY!!  and remember to use headphones/loudspeakers for best sound quality!! 

This looks like an interesting app, with an odd use of the word 'lite'. 

Some kind of a glitch 5 track groovebox. 
For each track you may assign volume, pan, gate, speed (pitch), attack and decay times.  25 samples. 
Also there is a master effect unit with LP distortion, digital lofi effect, and a short delay. 

The interesting thing (which differs this app from other grooveboxes) is shuffle editor.  You may define overall shuffling pattern in addition to common beat pattern.  So you could make some jazzy grace notes and non staight beats. 

There is some kind of an automation for pitch.  You could setup it's variation to bring more life into your beat sequence. 

The word "lite" means it has NO RECORDING (only pattern saving) and song editor yet. 

Stay tuned for updates! 

The developer's site goes on to say that he's planning to implement ACP and more.