Has a bug fix for 3-ways with a midrange having higher order highpass that truncated the summed response if the midrange low end went down to 0db.
The polar response section is improved to more accurately reflect the off-axis response. Please read the Help provided carefully. It's important to follow the instructions if you direct measurement files that are post-processed to be minimum-phase. The polar section will need to be filled in appropriately to get the correct on-axis response from measurements.
If you use direct measurements not post-processed (includes excess-phase), then the polar response section should be left alone. If you enable the polar section, both the off-axis will not be accurate, but more importantly, the on-axis will not be correct, either. Excess-phase files are good for one point in space only, the measurement point.
If you use SPL traced files (minimum-phase) , the Reference Angles should be left at 0, since traced files usually are derived from individual driver on-axis response curves, but all other polar setup values should be entered and used.
Details are in the Help of the program and at the WinPCD web site, but to point it out here, the driver diameters are never required, but help to provide more a better indication of the off-axis. If they are left at zero, the off-axis only shows the crossover effects.