SBOOTH  Version 0.9.1 works with Snow Leopard  
(Version 0.9)

SBOOTH  DSP effects are added in the Preferences, on the DSP pane. You should see a menu of available effects when clicking on the Plus button at the bottom  
(Version 0.2)

SBOOTH  There seems to be a problem with the Intel versions uploaded on SourceForge. I've re-uploaded a version that works correctly, but it might take some time to appear on all the servers. In the meantime you can download a working version at http://sbooth.org/files/Play-0.2.tar.bz2  
(Version 0.2)

SBOOTH  Yes, Max can read and write WavPack.  
(Version 0.6.1)

SBOOTH  I've added this feature for 0.5.6  
(Version 0.5.5)

SBOOTH  This will be in the next version; I just haven't gotten to it yet.  
(Version 0.5.5)

SBOOTH  You can convert files from one format to another! Select the output formats as normal, and then either drop files into the converter window or select "Encode Files..." from the File menu.  
(Version 0.5.4)

SBOOTH  Right now Max can only use compact discs as an audio source. So you will be unable to encode anything from WAV, AIFF, etc with the current version.

Sorry!  
(Version 0.4.1)