Audiophilleo1 and Audiophilleo2 firmware update history:

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IMPORTANT NOTICE:
In order to install any firmware version 1.11 or above, you must first be on at least version 1.10.
For example, if your device is using v1.09 and you want to install 1.11, you must first install 1.10, then 1.11.
If your device already has 1.10 or above installed, there is no need for this.

NOTE:  Please follow the firmware update procedure as defined in the user manual.

NOTE:  Firmware 1.20 or above is required for proper operation with the PurePower option.
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April 11 2012: V1.20

- First public release of firmware to be used with PurePower supply.  Please upgrade to this if you have an earlier beta installed
- ap1: "SPDIF underflow" and "No Ext Power" error messages are no longer displayed unnecessarily.
- ap1: Fixed bug which could cause the device to brick due to Flash corruption.
- PureMusic plays silence when stopped (instead of stopping the audio stream).  This caused things like 12V trigger or the output stage to never turn off.  This has been fixed such that silence is considered to be a stopped stream.

January 24 2012: V1.16

- General fix to firmware upgrade.  When playing firmware in loop mode, this sometimes prevented the firmware file from being accepted. This is no longer the case.
   This will hopefully make firmware upgrade more reliable.
- ap2: Fixes made to the "Max 96 Khz" setting.  Now playing the Max96_enable.wav file should more reliably turn on this option. To enable this setting, follow the same procedure that is used for firmware update    except that the Max96_enable.wav file is played.  The LED should display LSSSSLL followed by LLLS (for Max96 enable) or LLLSS (for Max96 disable).  This setting is useful under XP if your DAC does not support more than 96Khz.
- ap1: phase inversion now prevents clicks when audio is clipping.
- Under OS X, fixed a bug that under specific conditions caused the AP to be detected as a full speed device, causing 176.4 and 192 Khz rates to not function.

December 13 2011: V1.15
- Under OS X, fixed a bug that under specific conditions caused the AP to be detected as a full speed device, causing 176.4 and 192 Khz rates to not function.
- ap2: added ability to set the "Max 96 Khz" setting by playing a special audio file.  This can be used to disable 176 and 192 Khz support if you DAC does not support those sample rates.
       NOTE:  This setting should not be used Windows installations which use the custom driver.
- ap1: the "burn-in" menu can now be used to turn factory burn-in mode off.
- playing any audio will now turn off factory burn-in.
- serial number descriptor now gets set properly.
- Lowered sleep mode power usage
- Under OS X, fixed a bug that caused the IR remote to only be able to put the computer to sleep once.
- Preparations for the battery power supply.
- False "spdif underflow" erros have been removed.

August 3 2011: V1.14
- Now LED message "LSLL" (firmware updated message) is shown properly after firmware update.
- ap1: VirtualCable feature did not work properly in 1.13 and is now fixed.
- ap1: display is now a bit brighter

June 16 2011: V1.13
- ap2: now computer can enter sleep and hibernation states
- general sleep/hibernation mode improvements and lowering of power consumption
- seeking in foobar2000 with ASIO4ALL now works properly.
- LLSLL is no longer displayed erroneously when switching sample rates.
- Miscellaneous updates and fixes.  This includes occasional white noise when switching sample rate or music.  Please contact support if the white noise issue persists.
- ap1: when in volume "pro" mode, mute is also handled internally.  This allows for PM HOG mode to work with mute (since the default device is not the ap1).

February 28 2011: V1.11
- ap1: SPDIF->Advanced->Mono menu added which outputs a monaural mix to both the left and right channels.
- ap1: Added "Max 96" setting so the audiophilleo tells the computer that it only supports up to 96 kHz (for XP users)
- Detect USB CRC checksum data errors and show error message via LED and screen.

February 28 2011: V1.10
- USB power requirements are now reported at 380ma instead of 400ma since that is more accurate.
- Handling of external power supply capability added.
- ap1: Minor user interface fixes, including properly redrawing the screen when the computer transisionts from sleep to resume state.
- Status LED now better distinguishes between long and short blinks to make resising messages easier.

January 3 2011: V1.09

- Improved compatiblity with Mac Mini to avoid buffer under and overflows and dropouts.
- ap1: Added volume balance control.
- ap1: Enhanced numeric up/down display.
- 192Khz rate uses less CPU, making device more responsive to user input.
- Improved algorithm for saving settings fo flash.
- Reduced power consumption while computer is asleep.  Improved sleep mode display.
- ap1: Improved the way display dims and powers down.  "Display->When Playing" menu now works correctly.

October 20 2010: V1.08

- Device is now properly recognized as SPDIF device instead of speakers.  This allows for AC3 and DTS passthrough.
- Device is now compatible with windows XP and iPad (requires upcoming iOS 4.2).
- Windows XP does not require any custom driver even for 176Khz and 192Khz sample rates.
- Improved feedback algorithm so prevent occasional pops/clicks with some computers.
- Under windows, 176/192 rates are now selectable without the custom driver, but it only works on a minority of computers.

September 6 2010: V1.07

- ap1: Changing phase now causes no glitches.
- ap1: BitPerfect testing no longer tries to recover from errors.  This gives more accurate results for individual errors.
- ap1: Improved BitPerfect messages.
- ap1: OSX volume control can now be set to 0dB.
- Increased SPDIF output buffer sizes for higher reliability.

September 2 2010: V1.06

- ap1: Improved overall look, fonts, and main screen.  Moved buffer/cpu information into menu->status screen.  When changing volume, large numbers are displayed for readability.
- ap1: Added option for inverting and dimming the display as well as controlling display sleep during playback.
- ap1: Clicking joystick on menu item causes submenu to be entered (in addition to pushing right).
- ap1: Joystick left in main screen reverses polarity.
- ap1: When trying to enable JitterSim and sample rate is not a multiple of 44.1, an error message is now displayed.
- ap1: During playback, equalizer now shows at least one bar even at lowest volume.
- ap1: Volume control now has am optional "pro" mode in which the computer does not control the volume.  All volume changes are handled
	internally to the ap1.  This has the advantage of giving more precise dB steps when changing the volume.
- ap2: HID devices no longer appear with ap2 since they are not used.
- 176 and 192 Khz rates now appear in windows even without the custom driver installed, but they are not selectable.

V1.05

Note: Upgrading to this or higher firmware from version 1.04 or below will clear all your settings and learned remote control commands.

- ap1: Fixed occasional click when changing volume.
- ap1: Fixed unwanted Volume changes when pressing joystick down and not in main screen.
- ap1: Added smoothed volume changes when muting.
- ap1: Added absolute phase inversion feature.
- ap1: When holding down remote control volume button, rate of change increases over time.
- ap1: buffer information at bottom of main screen no longer flashes red & green because it was confusing.

V1.04

- Enhanced sleep/wake functionality with better Operating system detection
- Enhanced Linux feedback handling 
- ap1: Fixes to "SPDIF->Advanced->Test Wave", which was generating the wrong frequencies.

V1.03

- updated LED status messages and documented them in user manual

V1.02

- initial release