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 TrueRTA Current Version and Upgrade Information

TrueRTA is currently at Version 3.5.6 and runs under Windows Vista, 7, 8 and 10.

All Users of Version 3 can upgrade just by downloading and installing the current release. Your registration information will be found automatically.

Version 2.0 Users (obsolete version): Special upgrade pricing is available for upgrading from Version 2. catalog page  
                            The final release of V2.0 is still available here: Download Version 2.0.3

Parts Express Users:  Click Here for Parts Express User Support and Downloads 


TrueRTA Revision History

TrueRTA Version 3.5.6 is released


  • Added a preference setting for selecting inter-channel sample offset. This helps to achieve precision nulling with a wider variety of hardware.

ALL TrueRTA V3 users can download this FREE UPGRADE!

TrueRTA Version 3.5.5 is released


  • Improved behavior of input edit fields.
  • Generator frequency is saved with up to two decimal digits of resolution

TrueRTA Version 3.5.4 is released


  • Fixed a bug related to Level 3 Quick Sweep

TrueRTA Version 3.5.3 is released


  • Improved the Audio Selection Dialog to display many more audio devices
  • Improved the oscilloscope triggering and sweep behavior
  • Numerous other small improvements

TrueRTA Version 3.5.2 is released


  • Fixed a bug where the line in calibration could become corrupt between launches

TrueRTA Version 3.5.1 is released


  • The application now remembers audio device selections between launches
  • Revised the Audio Device Selection dialog to shift output devices to the top of the list
  • Revised to maintain separate calibration settings from previous versions
  • Adjusted default calibration for the Behringer UCA202 USB Audio Interface
  • Other small bug fixes and improvements

TrueRTA Version 3.5.0 is released


  • Fully Compatible With Windows 7 (both 32 and 64 bit editions)
  • Added a new Audio Device Selection dialog for selecting input and output devices from within the application.
  • Quick Sweep was improved to operate at any signal level
  • Expanded User's Guide
  • Revised default calibration for the Behringer UCA202 USB Audio Interface
  • Numerous small bug fixes and improvements

TrueRTA Version 3.4.1 is released


  •  Fixed a bug where V3.4.0 lost the project notes of older files.
  • This was the last version that ran under Windows versions prior to Windows XP.      Download TrueRTA v3.4.1

TrueRTA Version 3.4.0 is released


  •  The internal data structure was widely revised and simplified with the result that the analyzer now runs more efficiently with significantly reduced CPU usage.
  • The precision of all utility functions is improved with the new structure. The smoothing utility now operates with essentially no perceived delay'even for the broadest smoothing operations. The reduced processing time allowed the upper limit of the smoothing range to be increased from 1 octave to 5 octaves.
  • The accuracy for repeated data export/import is now excellent.
  • Further benefits for the revision include greatly reduced file size and faster file operations. Note that project files saved with previous versions of TrueRTA are forward compatible with the new version. However, files saved with the new version are not backward compatible with previous versions.
  • The Peak Hold bar display mode was revised to also show the live data within the peak.
  • A Trigger Level Control and selection for Automatic Triggering were added at the Oscilloscope Tool Bar. Scope triggering is now much like that of a bench-top scope. Scope trace printing was changed so that traces are not printed outside the scope area.
  • The Oscilloscope display can now be scrolled horizontally using Alt+Right and Alt+Left. A preference selection was added to choose DC offset removal at the oscilloscope. The oscilloscope now uses separate DC offset removal for each of the two channels.
  • A preference selection was added to allow the scope trace to be viewed as isolated data points rather than line-connected points. This provides a more intuitive view of higher frequency waveforms where line-connected points are not representative of the true analog waveform.
  • The 'Black' color scheme was revised to provide more vivid colors but with reduced plot grid brightness.
  • The Generator Dialog Bar's tab order was corrected.
  • Many other small improvements were also made.

TrueRTA Version 3.3.4 is released


  • The on screen meter display readings (dBu, dB SPL and crest factor) are now saved with each memory.
  • SPL Measurements are now portable between different PCs.
  • The maximum number of imported data points has been increased from 850 to 5000.

TrueRTA Version 3.3.3 is released


  • The Help System is now fully VISTA compatible.
  • The new software installer is more compact and is compatible with a broader range of Windows versions.

TrueRTA Version 3.3.2 is released


  • Fixed a bug in the sum and difference utilities

TrueRTA Version 3.3.1 is released


  • Both Memory 1 and 2 are now drawn while the analyzer runs to allow upper and lower limits to be displayed while data is collected
  • Fixed a problem where the scope trace was not seen after Quick Sweep

TrueRTA Version 3.3.0 is released


  • Added support for House Curves including SMPTE X-Curves
  • Fixed a problem with peak hold
  • Added a preference to enable/disable Automatic Notes
  • Increased the Notes area from 2 lines to 5 lines of text

TrueRTA Version 3.2.0 is released


  • Added new generator waveforms: square, triangle, saw tooth and impulse
  • Added the capability to adjust the square wave duty cycle
  • Expanded metering to include dBu peak numeric display
  • Increased metering display from 4 digits to 5 digits precision

TrueRTA Version 3.1.1 is released


  • Fixed a bug where averaging required that Memory 1 be used.
  • Fixed a bug where the dB boxes did not update completely when a project file was loaded.

TrueRTA Version 3.1.0 is released


  • TrueRTA now saves and loads Single Memory Files (.rt1 file type) to facilitate creating custom reports with mixed data from more than one project file.

  • Project files now save and load the complete application setup so that 'test setup' files can be saved and when loaded they completely restore the test setup in addition to the saved data. Saved settings include dB and frequency limits, the Mic calibration file, window size and position'over application 50 settings in all. Old file types can still be opened but will be saved in the new file format.

  • Now exports the full frequency range of data rather than just the selected range.

  • Revised and updated the Help Topics.

  • Added custom file icons and the ability to open a project file by either double-clicking the icon, or dragging the icon and dropping it on the application window.

  • Fixed a bug where the utilities could give bogus results if the FFT sizes or input sampling frequencies of the data were not matched.

  • Fixed a bug where importing data breaks Mic Cal interpolation.

  • Fixed a bug where exported data was not calibrated for all sampling frequencies.

TrueRTA Version 3.0.3 is released


  • Fixed a bug where a bar was drawn at the left edge at startup

TrueRTA Version 3.0.2 is released


  • Improved the performance of  Quick Sweep
  • Fix a bug that caused a crash on exit if running
  • Fix a bug in the smoothing utility
  • Fix a bug related to importing data in the SPL mode
  • Fix calibration error related to input F(s)
  • Improved computational efficiency at the plotter
  • Change default to analyzer not running at startup
  • Revise the Black and Dark Gray color schemes for less contrast

TrueRTA Version 3.0.1 is released


  • The smoothing function was revised.
  • The installation folder was changed to TrueRTA_3

TrueRTA Version 3.0.0 is released


This is a major new release with many new features including:

  • Project file saves measurements and notes
  • Memory Bar with 20 memories
  • Greatly expanded and improved printing
  • Data Import with interpolation
  • Notes Bar with Auto Notes
  • SPL Scale and SPL Calibration
  • Post Processing Utilities
  • Cursor Readout
  • Sound System Cal and Mic Cal now export
  • Max Sampling Frequency increased to 96 kHz
  • Now saves one scope trace with the Project File
  • New Preferences Settings

TrueRTA Version 2.0.3 is released


Reviewed and revised buffer sizes and thread priorities to level CPU usage.
Faster operation at low sampling frequencies improves very low frequency work. 
Corrected dB references to consistently refer only to "dBu" (.775vrms).
Improved scope stability and reduced scope's CPU usage.
Revised the CPU usage warning dialog that would sometimes not draw right away.

Click here to download the final version 2 release: Download Version 2.0.3

TrueRTA Version 2.0.2 is released


Improved stability of audio input/output operations. 
Disabled certain commands while Quick Sweep is in progress.

TrueRTA Version 2.0.1 is released


Revised Quick Sweep for less overhead so it runs better on slower PCs. 
Added a button to select default calibration at the Line In/Out calibration dialogs. 
Now does a second sweep after sound card calibration to show corrected response.
Fixed a number of small bugs.

TrueRTA Version 2.0.0 is released

New features include a "Quick Sweep" feature that automatically generates a digital sweep and acquires the frequency response with a single click. There is a new calibration procedure that removes your sound card's response from your measurements. There is also a new "Relative Mode" feature that allows you to use any response curve as the reference for subsequent measurements. The line mode plots now have a smoother look due to a change in how they are plotted. The interface has been largely redesigned. You can now export response data.

TrueRTA Version 1.0.0 is released

The initial release of TrueRTA.

TrueRTA Troubleshooting:

Here are the most commonly reported problems along with suggested solutions. Also see the FAQ.

After clicking OK at the calibration dialog I can no longer see any response:  

Your TrueRTA is probably miscalibrated. The quick fix is to go to the Audio I/O menu and open the Line Out and Line In Calibration dialogs. At each of these dialogs click on the button labeled "Restore Default Calibration." That should fix the problem.

 I seem to be getting feedback of some sort:

You may have the Windows Playback mixer set wrong. Open the Windows Playback mixer and make sure that you DO NOT have Line-In selected and that the Line-In fader is at minimum. Only the WAVE signal should be selected at the Play mixer. (a hard wired feedback loop can be created if you are in loopback configuration with the Line-In signal is selected and fader raised...not good) This can cause a wide range of strange problems.

Send us mail detailing any other questions or problems: support@trueaudio.com


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