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+ use GNU Radio preferences file to set default input and output audio device, if provided;
+ use gr::logger for all non-debug messages;
+ case-insensitive string find with desired audio device name;
+ fixes buffer allocation bug with low sample rates;
+ allows using a specific (named) audio device, or the default;
+ handles the case when the selected audio device becomes unavailable (e.g., a USB stick is removed while in use);
+ if no audio device name is provided, uses the default audio device as found in System Preferences::Sound;
+ handles the case when the default audio device is in use, and the user changes that audio device in System Preferences::Sound, by internally resetting to use the newly selected audio device;
+ all non-Apple names are now lower_case, not CamelCase;
+ move osx_impl functions to gr::audio::osx, and use them correctly;
+ install osx_impl.h to expose gr::audio::osx functions, but iff OSX audio is enabled.
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