Looks like NLogSynth PRO update is coming very soon

Poly aftertouch for onscreen & external keyboards (choose in mod matrix), 64bit native processing for newest devices, optimized sound engine

— Tempo Rubato (@nlogmusic) January 26, 2014

In fact I've rewritten the sound engine. Choose audio buffer size in iOS settings app. Many fixes, ok not so many since NLog is stable ;-)

— Tempo Rubato (@nlogmusic) January 26, 2014

On iPad Air & retina mini you can set to run with 128 buffer unless using many other apps in parallel. Check in the iOS settings app.

— Tempo Rubato (@nlogmusic) January 26, 2014

Further, control rate has been down to 16 samples for iPad Air & retina mini. This is what typically digital pro hardware synths use today.

— Tempo Rubato (@nlogmusic) January 26, 2014

Go to mod matrix, choose "Aftertouch" as source & set up to 3 destinations. Use vertical movements onscreen, or capable external controller.

— Tempo Rubato (@nlogmusic) January 26, 2014