>Can you explain the default file a little better.
>ie. what should the actual file name be and where should it be?

On Unix, there are two files in your home directory:
	.RATdefaults
	.RTPdefaults

The .RATdefaults file can have the following entries:

*audioTool: RAT v4.2.5 SunOS 5.7 (sun4u)
*audioLoopback: 0		--+
*audioAGC: 0			  |
*audioEchoSuppress: 0		  |
*audioLecture: 0		  +-- 0 = disable, 1 = enable
*audioPowermeters: 1		  |
*audio3dRendering: 0		  |
*audioLimitPlayout: 0		--+
*audioMaxPlayout: 2000		  +-- If audioLimitPlayout is enabled, 
*audioMinPlayout: 0		--+   specify limits in milliseconds
*audioPrimary: GSM		  }-- Primary codec
*audioUnits: 1			  }-- Number of frames of audio per packet
*audioChannelCoding: None	  }-- Type of channel coding used
*audioChannelParameters: 	  }-- Optional channel coding parameters
*audioRepair: Pattern-Match	  }-- Type of repair used
*audioSilence: Off		--+-- Control silence suppression
*audioSilenceManualThresh: 100  --+
*audioAutoConvert: High Quality   }-- Type of sample rate conversion
*audioChannelsIn: 1		  }-- 1 = mono, 2 = stereo
*audioDevice: Sun Audio Device	  }-- Audio card being used
*audioInputPort: Microphone	--+
*audioOutputPort: Headphone	  |
*audioInputGain: 49		  +-- Record and playback device,
*audioOutputGain: 43		  |   sample rate, and volume
*audioFrequency: 8000		--+
*audioInputMute: 1		  }-- Start with transmission muted?
*audioOutputMute: 1		  }-- Start with reception muted?

All apart from the last two options are saved automatically, and correspond 
to options which can be set in the user interface. The audioInputMute and
audioOutputMute settings are never saved, but are used in the are manually
added to the settings (hence can be used to force rat to transmit on startup).

And .RTPdefaults has a similar format, and corresponds to the setting in the
personal details options panel.

*rtpName: Colin Perkins
*rtpEmail: c.perkins@cs.ucl.ac.uk
*rtpPhone: +44 171 419 3666
*rtpLoc: University College London
*rtpNote: 

On Windows machines, the settings are stored in the registry under
	Software\Mbone Applications\rat
	Software\Mbone Applications\common
in HKEY_CURRENT_USER. The settings which may be stored here are the 
same as those in the unix version, and may be edited with regedit.