ESL Cyber Listening is probably the best, although I wish they had better sound quality.
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				how to convert RAM files to Wav files
			
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  You'll need to download a converter. Just google 'convert RAM to WAV'. You'll find a free one if you hunt around. 
Another option is to record your own dialogues either lo-tech using a mic connected to your PC or hi-tech at a recording studio (it may be cheaper than you expect). I'm fortunate enough to have access to a recording studio and there's nothing like customising your own audio.