I never heard about the Philips SAA, I will check it out. Appears like a great soundchip.
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Btw, I was using DefleMask in "bug searching mode" and I found a very strange bug that was added in DefleMask in the latest release.
When you swtich to the instrument list with F1 while your mouse was over a pattern matrix button, DefleMask will continue check for the Pattern Matrix and you will be pressing the latest button even if you want to press in any other place.
It was a very stupid bug, and it is absolutely fixed now.
Also, now if you are editing an instrument and you select another from the Instrument List, the Instrument Edit Window will change to the selected instrument too, it is more intuitive now.
So, please re-download DefleMask, and if you find a bug or something strange or something to add, feel free to post it on the DefleMask's Forum.