Sketch Synth 2 - Shape and Sculpt sounds with a selection of pad based instruments, each containing an XY pad that controls 8 loops and 4 effects, possibly best referred to as a pad based rompler. The whole premise of Sketch Synth 2 is to make it easy for you to draw sounds and draw on effects to give your sounds geometric character without having to learn anything complicated, just push buttons and draw sound.

This version ships with 6 instruments:
* Punisher - dark wobblers with dubstep drums
* Noise Valley - a range of windy and tranquil noises to sculpt
* Psycho Trance - fast upbeat arpeggiated synth sounds
* Falling Grace - darker trance patches
* Chip Tune - chirpy acidic sounds
* The Kraken - underwater sounds

As of version 1.2.0 in Blueprint Mode you can fully customize your pads, visually and you can assign loops to every pad on screen. There is also an FX mode which lets you apply up to 9 effects in parallel.

I've had a look and because of the framework used for this app I at first think it will be impossible to support AudioBus, but I've had some new ideas and am looking into it as hard as possible.

1.2.1 Update
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A shortcoming of the current version is the lack of recording level monitoring, mute and solo buttons.

1.3 Update
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Sketch Synth 2 now contains voting controls for what the next feature to update should be, currently AudioBus is leading the votes, I've been pulling some late nights but the framework used for Sketch Synth doesn't seem to support audio in the background whatever I do, so I'm looking at it and will see what I can do. Scales & Arpeggios are the next most popular request