V3.22 is now available on the website.
The main functional change in this build is the addition of support for microphone/SPL meter calibration files. The Wizard can load files containing the gain (and optionally phase) characteristics of the measurement device and subtract those from the displayed responses. The response of the mic/meter alone can be displayed by selecting the Mic/Meter Cal trace on the graph panel. If using a C weighted meter the C weighting compensation will still be applied outside the range of the cal file data - e.g. if the cal file data starts at 500Hz, C weighting compensation can still be applied for the region below 500Hz (and the region above the highest frequency in the cal file).
On the measurement side a "Window" control has been added to select the period over which the impulse response is analysed. The default is 600ms, which should work well in most rooms - however smaller rooms may show noisy responses with a 600ms period, if so try reducing it. Chirp Z Transform is now used on the impulse responses to provide frequency response at intervals independent of the FFT length, for measurement spans below approx 2kHz the interval is 0.1Hz, for a full sweep of 10Hz to 20kHz frequency interval it increases to 1Hz. The recommendation for AV processor input sensitivity (where this is adjustable) has been changed from 2V to 0.5V, should reduce the volume settings required for measurement. There are also two bug fixes, C-weighting compensation was not being applied for sweep measurements and the overall level of the sweep measurement was offset if the measurement level was not -18dB (must try harder).
In the User Interface there have been a few rearrangements, partly to make provision for some features to follow in future releases. The main filter control panel has been moved to the right hand side, swapping places with the signal generator panel, and a couple of the options for filter optimisation have moved into the Equaliser menu. There are also new File menu options to save and load a single channel's filter set and a new submenu for exporting data. Preview capability has been added to the file chooser dialogs so you can see information about files before loading them. The results of Find Peaks are now displayed in a table, with the ability to sort the results by amplitude or frequency by clicking in the table header area.
To help people running the Wizard on Macs, which only have a limited implementation of JavaSound, the wave volume control is now active if the Java Sound Audio Engine has ben selected as the output device.
Quite a few other changes, mostly minor, full details on the Revision History