Changes:

• Added a gain slider for overdrive/distortion effects
• Added a tape delay effect unit
• Added a button to lock sequencer controls
• Added a mute button
• Modified the behavior of the start/stop button: when an external clock source is used, tapping resets the sequencers playhead
• Reduced playback buffer duration to 3 msec for iPod Touch 2G, 12 msec otherwise
• Bug fixes, optimizations