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Most recent information
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The most recent versions of the software/firmware for this unit are as follows.

Windows
    Software     :V4.00 (Previously V3.00. Updated at this time)
    Firmware     :V2.00 (Previously V2.00. Not Updated at this time)

Mac OS
    Software     :V2.10 (Previously V2.10. Not Updated at this time)
    Firmware     :V2.00 (Previously V2.00. Not Updated at this time)

We request that you always use the latest software/firmware version for this unit.
For information about the latest software/firmware, check the TEAC Global Site (http://teac-global.com/)
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<< New functions >>
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Additions in version 4.00  (2020.01.10)

 -Buffer Size can now be set from 4 samples. (Windows only)
 -Scaling to a suitable size now occurs with 4K and other high resolution displays. 
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Additions in version 3.00  (2019.03.27)

 -The Basic driver (US-20x20 ASIO, US-20x20) and the Mixing driver (US-20x20 Mixing ASIO, US-20x20 Mixer) have been 
  unified into one driver.
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Additions in version 2.10  (2016.12.07)

Note: When update the Settings Panel to Ver2.1 from the automatic update function in Mac OS environment, 
      the driver may appear in different name as "US-16x08" (US-16x08.pkg), but it is compatible with your device.

 -A True Bypass function has been added.
  The input and output are now matched binary when bypassing the Mixer signal processing section.
 -"OFF" can now be selected as input routing from Computer Out to Stereo Bus.
 -In mic pre mode, "Digital Inputs" can now be selected as an input source, allowing use as a DA converter.
  Input from Optical, Coaxial and other digital connectors can be output from the analog jacks.
 -As an emergency function, the clock source can now be changed through hardware operation.
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Additions in version 2.00  (2016.11.09)

 -A new software/firmware notification function has been added.
  When a new version is available, updating to it is possible by just clicking, "Update now" in a pop-up menu.
 -Simultaneous playback of ASIO and WDM is now possible by selecting the "US-20x20 Mixing Driver".
 -Depending on the computer operating conditions, latency might be lower when the old driver is selected,
  but simultaneous playback with WDM will not be possible.
 -A link to the TASCAM website has been added to the Help menu.
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<< Maintenance items >>
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Fix in version 4.00  (2020.01.10)

 -Operation stability has been improved.
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Fix in version 2.11  (2019.02.25)

 -Bugs with Windows 10 October update (Ver. 1809) such as glitch noises and audio tracks unable to be played have been
  fixed. 
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Fix in version 2.10  (2016.12.07)

 -Operation stability has been improved.
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Fix in version 2.00  (2016.11.09)

 -Operation stability has been improved.
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Fix in version 1.02

Firmware
 -When using an external digital clock, that Sample Clock Source setting is now maintained even if the clock becomes
  temporarily unavailable.

Windows Software
 -Changes were made for compatibility with the firmware.

Mac Software
 -Changes were made for compatibility with the firmware.
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Fix in version 1.01

Firmware
 -MTC could not be input. This has been fixed.
 -Operation stability has been improved.

Mac Software
 -Latest version includes a bug fix for OS X Mountain Lion(10.8.5) users where the settings panel failed to launch.
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