A new pre-release for the QA403 and QA402 is located HERE
There are two new plug-ins with this release in additions to improvements and bugfixes. The first plug-in (SPKR THD versus Frequency) will let you subject a speaker to a tone burst and will iterate to determine the user-specified THD levels for two thresholds. The graph will appear as follows:
The second is an improved version of the QA401 Speaker Compression plug-in (SPKR Chirp Compression). This will subject a speaker to series of chirps and will allow you to see where the speaker + amp begin to compress. This is a great way to quickly verify the health of a powered cabinet if you are running a rental business. But it can also help you quickly determine the headroom of a new design.
More info on the SPKR THD plug-in is HERE
More info on the SPKR Chirp plug-in is HERE