TC-11 Multi-Touch Synthesizer updates

Lots of fixes and some new things too. Here's the list:

Version 1.5 New Features:

• 32 new presets!
• option to run audio while the app is in the background
• patch preview window in the Load / Save view

Improvements:

• AM depth starting volume (patch option)
• sequencers can lock steps between themselves
• sequencers playback buttons

Bug Fixes:

• fixed audio drop out when switching apps
• fixed module connection errors
• multiple ahdsr bugs fixed
• multiple lfo bugs fixed
• multiple sequencer bugs fixed
• fixed custom grids sometimes not appearing
• fixed Controllers Used table errors
• touch preview activity prevents rotation
• fixed Patch Gain parameter controller display bug
• fixed gyroscope pitch clipping