I think you can't able to convert .rec file to txt file. You can convert it into mpeg file.

Using the Manager-Software and also with the "UMS Converter" (which allows you to convert .rec files using the UMS firmware, which I personally prefer),

In both ways the .rec file is only converted to a .wav file!! In the help section of the Manager it says that you can convert the .rec file into a mp3 file, but I still haven't figured out.

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suresh