These dates show when I sent the update to Apple; Apple typically releases to the public a week later.

Android version 1.0.1, 10/3/16

- Fixed the behavior of pressing multiple chord buttons together. In this case, all the strings muted by each chord button should be muted together.

- Fixed the behavior of pressing a different chord button while a previous chord is playing. In this case, all the strings muted by the new chord button should be muted.

- Enlarged the touchable area around the Settings, Info and Zoom buttons to make them easier to press on smaller screens.

- Dropped support for Android 2.

iOS Version 2.2.5, 10/2/16

- Updated for iOS 10.

- Fixed the behavior of pressing multiple chord buttons together. In this case, all the strings muted by each chord button should be muted together.

iOS Version 2.2.4, 7/24/15

- Fixed the digital effects on iOS 8.

iOS Version 2.2.3, 3/12/14

- Fixed the calibration of string locations on an iPad when zoomed in.

- Added a setting to hide the status bar on an iPad running iOS 7, to avoid swiping to show the Notification Center in landscape orientation.

Android Version 1.0, 3/9/14

- Initial release. The Android version includes the same core functionality as the iOS version, but does not yet include digital effects, custom layouts or MIDI.

iOS Version 2.2.2, 3/9/14

- Renamed the Use Reverse Slant setting to Reverse Button Layout, and extended it to apply to both 15- and 21-bar layouts.

- Added a Reverse Chord Sequence setting, which reverses the sequence of chords from top to bottom, for optional use with left-handed setups.

- Fixed the sequence of strings when using the left-handed setup.

- Fixed the button layout and strum area on iPhones and iPods using the left-handed setup.

- Restored some strings that were hidden on non-Retina iPhones and iPods.

iOS Version 2.2.1, 2/25/14

- Fixed layout errors when using the new left-handed and reverse-slant options in conjunction with the zoom function.

- Updated the chord button labels to auto-size to fit longer chord names.

- Removed all unused strings when changing to a layout with fewer strings than the previous layout.

- Stopped mirroring the logo text when using the left-handed option.

iOS Version 2.2, 2/18/14

- Added more notes to the custom layout options. The app now has 53 possible notes, from C2 to E6.

- Added more strings to the custom layout options. Layouts now can include anywhere from 24 to 42 strings.

- Added an Edit Sequences button at the bottom of the layout editing window. When you tap this button, the items in the string and chord lists become draggable, so you can quickly rearrange string and chord button assignments.

- Added the button number to chord buttons that don't yet have a chord assigned, so you can more easily find and edit that chord button in the layout editing window.

- Added a Left-Handed Setup option to the Settings window. When enabled, the autoharp image and all the buttons will appear as a mirror-image of the standard setup, for left-handed or tabletop play.

- Added a Reverse Slant option to the Settings window. When enabled, the chord buttons in 21-bar layouts will slant in the opposite direction, but retain their same sequence. This option has no effect on 15-bar layouts.

- Added a Mute Audio option to the Settings window. You can use this to disable the app's built-in audio if using the app as a MIDI controller to play audio from a sound module.

- Added a Logo Text option to the Settings window. If you enter text here, it will appear in the logo area of the autoharp graphic. Now you can create your own autoharp brand. :-)

iOS Version 2.1.5, 1/9/13

- Updated the MIDI functionality to always send a note-off message before sending a note-on message, to reset any strings that are already sounding.

iOS Version 2.1.4, 10/14/12

- Updated for iOS 6 and iPhone 5.

- Adjusted the Show Active Strings and Leave Buttons Pressed settings to update the display immediately after changing the setting.

iOS Version 2.1.3, 6/19/12

- Adjusted the internal volume controls to avoid distortion when strumming loudly.

iOS Version 2.1.2, 5/18/12

- Improved the tuning of the strings. (Most strings were sharp about 6 cents.)

iOS Version 2.1.1, 3/19/12

- Updated graphics for the new iPad's Retina Display.

iOS Version 2.1, 1/24/12

- Corrected an error where audio could stop after using audio in another app, such as making a phone call or using Siri.

- Added an option to the Settings window to send MIDI on a selected channel. When selected, the app sends a MIDI note-on message for each string that you strum, and a note-off message for each string muted by a chord change or for all strings when you use the "stop strings with multiple fingers" option. The app still plays audio when sending MIDI, but you can turn down your device volume to avoid hearing it. The MIDI option only appears for devices running iOS 4.2 or later.

iOS Version 2.0.1, 12/22/11

- Adjusted the audio settings to play even if the device is muted.

iOS Version 2.0, 10/17/11

- Rewrote the audio processing code from the ground up to reduce latency and avoid volume issues.

- Enabled plucking multiple strings simultaneously.

- Reduced the volume of muted strings by half to allow more control when adding muted string sounds at a low volume.

- Enabled muting all strings by laying your fingers across the strings. To use this feature, tap the Settings icon, turn on the Stop Strings With Multiple Fingers switch, and select a number for the Fingers Needed to Stop Strings option. A lower number will make the strings easier to mute, while a higher number will avoid accidental muting if you strum with multiple fingers. This feature requires iOS 3.2 or later.

- Added configurable chorus, delay and reverb effects. The app comes with one "starter program" that you can edit and save as often as you like. You can also create new programs and switch between your saved programs for a $.99 in-app purchase. To enable this feature, tap the Settings icon, then tap the edit button for Effects, then tap New Program.

- Added the ability to customize the autoharp layout and switch between your saved layouts for a $3.99 in-app purchase. This feature lets you change the note assigned to each string and the strings assigned to each chord bar. To enable this feature, tap the Settings icon, then tap the edit button for Layout, then tap New Layout. If you don't enable this feature, you can still switch between the standard 15-button and 21-button layouts, but the interface has changed: tap the Settings icon, then tap the edit button for Layout, then tap Standard 15 or Standard 21.

iOS Version 1.3.1, 7/26/11

- Corrected the positioning of the string hotspots when zoomed in. (Affects iPad only.)

iOS Version 1.3, 7/11/11

- Added a switch to the Settings window to show active strings. This highlights whatever strings aren't muted at the moment, so that you can more easily play individual strings within a chord.

- Added a switch to the Settings window to disable high performance audio. This avoids mismatched volume levels when your device's Sound > Ringer and Alerts > Change With Buttons is turned off. However, it may also create a delay in strumming. You can avoid both problems by [setting the volume in Ringer and Alerts to match your device volume, or by] turning on the Sound > Ringer and Alerts > Change With Buttons setting.

- Added a missing sound for the A# string in the second octave.

iOS Version 1.2.2, 2/10/11

- Cleaned up the animation of the status bar when changing device orientation (only affects iPad).

iOS Version 1.2.1, 10/25/10

- Added a setting to turn off the touch-sensitive string volume. This makes the instrument play more predictably in some situations. It could also be used to decrease latency issues, since dynamic volume requires more processing power.

iOS Version 1.2, 7/2/10

- Added hi-res graphics for the iPhone 4. (No changes for other devices.)

iOS Version 1.1.1, 6/9/10

- Fixed a crash when changing between the 15 and 21 bar modes.

- Fixed an issue where the artwork was incorrectly rotated after changing modes.

- Corrected the Bb key in the 21-bar mode, which was previously playing a B natural chord.

iOS Version 1.1, 6/1/10

- Added a 21-bar option.

- Added a "sticky buttons" option to leave a button active until another button is pressed.

- Added an option to mix in muted string sounds.

- Made strings strummable below the chord bars (iPad only).

- Added a warning when iPhone is in silent mode (iPhone only; silent mode suppresses most string sounds).

iOS Version 1.0.2, 5/11/10

- Corrected a wrong note in the Eb chord.

- Increased zoom amount (iPad only).

iOS Version 1.0.1, 5/5/10

- Corrected string muting behavior when pressing more than one button at once. Sped up button changing when playing along with iPod music.

iOS Version 1.0, 5/3/10

- Initial release.