Hello Naomi
  Goldwave a good choice =) 
 You want to record what you hear, so you need to configure your soundcard ( which is hopefully capable of it )to record" what you hear" 
 You have to set your Soundcard under " Volume Control " in the sub settings "record" 
 and activate " What you hear " 
 Maybe the name differs at your soundcard driver, but it should be named to somethin similar. 
 After that you can start "Godlwave", press the " new " button for making a new wav file for records.  
http://www.sal4.de/new/gwr1.jpg) 
 Set the lenght to 10 or more minutes, somedialogs are long and you have to add the time you GrimE is taking to start.
 I dotn know how good your pc is, but prepare yourself for some loading times after pressing "ok" 
 If you set more time then it will load more to a swap file ( you COULD change it to load it in RAM, but youґll need lot of it! ) 
 After that a wave cutting windows should show up, asweel the devie control ( if "Device controls" isnt up there, go under " Tools" and check "Device Controls"  
http://www.sal4.de/new/gwr3.jpg) 
 In Device Control pick up the "Record " slot and disable "CRTL Key safety" 
 After that , click ok and you can start record with pressing the big red button in Device Controls ;) 
 In while he is recording you can start Grim and go on with your dialog. 
 If youre done, then just quit GrimE open Goldawave.
 Stop the record, and go to " File -> Save as..." 
 There you can give it a name and let im save in mp3
 Should be named soemthing like "File type" 
 File attributes " 
 Layer 3,44100Hz, stereo, 160 kbps ( Dont have to be 160, 128 may be enough, but for my opnion its poor quality )  
 Sorry dont have any much time..hope it helps and works...tell me if there are some problems. Maybe I missed something.. 
 cioa 
 Sal