Here are some apps I'm having great creative fun with right now! All IOS

Novation Launchkey - Free (introductory offer) Get it now! A synth with dozens of sounds which you can edit the sounds in a really simple creative and visual way. Also arpegiator. Brilliant!

Samplr - £2.99 Plays sample loops and manipulates them in some incredibly creative ways.

Mint.io - Awesome sequencer, easily manipulated to do crazy things. Bass lines, drums, effects, synths & free. Superb!

Iterator FREE but will go back to normal price soon - Amazing sonic manipulator!!

eDrops Nature - free - delightful controlled chaos - very musical. Not free anymore :-( £2.99

sir Sampleton £2.49 - simple sampler with giant keys to play back

Voicer Free - record any sound in then add some great effects and play it with your finger.

i505 - Free - Really simple but powerful Drum Machine.

Balls - free - Ambient, colourful, mesmerising, beautiful, random and Free

Tiny Guitar - free - a guitar that helps you play and learn tunes by tapping the strings - Free

iAmDrums - free - Simple kit, with simple dynamics that you can play with your fingers - great sounds - Free

Orphion - free - Hard to describe - but really interesting way to play notes in any key - Get it while it's free!!

Guitar Chords - Free. A great app for choosing a chord on an acoustic guitar and either picking the strings or pressing the strum button. You can choose from major, minor, maj7 or min 7. Sounds great!

Drum Master - Free. Another Drum kit, two free kits to choose from. You can play along to your itunes songs.

iGrand Piano - Free - A great sounding piano which also has tunes to download. You can see the keys used as it plays. Satie Gymnopedie No 1, Beethoven Fur Elise and Mozart Piano Sonata in C are free.

Beat Slice - Free - Mash up your iTunes collection this great effects unit. Many creative possibilities!

Synth! Free - 50 synth sounds including a sampler! Simple but powerful.

Hokusai - free - Multi track sampler with some creative editing possibilities including playing the sample with your finger fast or slowly, back wards or forwards.

BeatPad Lite - free - 4 track drum sequencer with some string hits too. Play 16 pads and build up an interesting beat.

Rhythm Pad - free - Great drum machine, Lots of different genre kits, recordable and auto play.

Dubpad - free - Dubstep at your finger tips. Sounds great! 25 sample pads with pre recorded dubstep samples on. Limited but great fun

SphereTones – A Free ‘Visual Instrument’ - free - indescribably brilliant!!

Sythe Free - Some great sub bass on this baby.

Real Guitar - free - Choose a key and strum the strings - simple and good sound.

Leon - free - Theramin type device with some control over frequency. Best for special FX.

SFXR - Grimey old 8 bit game noise generator with some interesting edit buttons like random and mutate.

Epic Guitar Epic Drum Set Smule, Magic Piano Beatwave Bongos Grand Piano

Great synth

Not sure which ios it is, definitely not the latest though!! So far I have

Sound prism

BassGuitar

Voicer (not sure how useful witout mic)

Hokusai

Virtuoso

beatwave

goguitar

Iamdrums

Looptwister

hard to avoid clicking them 

as you play