The MasterQ's update is in preparation which will fix some minor problems with the MasterQ, improve functionality and finaly make an AU version available.
When using the FXpansion's adapter you have to make sure to use the latest version. Some previous versions had a compatibility problem with DP.
It is also possible that some glitches may occur when the audio buffers are set to very low values. This makes not very comfortable codintions for the MasterQ.
Regards,
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Mateusz Wozniak
PSPaudioware.com