* VST Effects now display in GUI mode by default
* Updated Nyquist implementation
* Improvements to Equalization, Noise Removal, Truncate Silence, Click Track and effects chains
* Improved Plot Spectrum analysis and new preferences for Spectrograms
* Record more than 16 channels (hardware/drivers permitting)
* New “Mixer Board” view with per-track VU meters
* AMR NB export support via the optional FFmpeg library (http://manual.audacityteam.org/index.php?title=FAQ:Installation_and_Plug-Ins#installffmpeg)
* 32-bit float data over 0 dB handled without clipping
* Draft Manual/Quick Help included in Windows and Mac installers
* Faster waveform drawing and better response in multi-track projects
* Various bug fixes, stability and accessibility improvements
See New in Audacity 1.3.8 (http://audacity.sourceforge.net/download/features-1.3-a#details) for more on the latest features and fixes.
Note: This release does not support Windows 98 or ME, for which 1.3.7 is still available (http://audacity.sourceforge.net/download/beta_windows#recdown).