I believe TEF SoundLab saves files in ASCII format by default. These files can be opened, viewed & edited in any text editor (like Notepad). I don't think the files can be imported directly into LEAP or other modeling programs but I may be wrong. Check LEAP's documentation as to whether this is possible. It is possible to format the data so that it can be imported easily.
Open the TEF file with a text editor, copy the contents of the entire file & paste it into an Excel spreadsheet. There will be a lot of information in the header section of the file. The labeling is pretty self explanatory as to what each line is. From the copied data you will need to calculate values to put into 3 new columns. These new columns will be Frequency, Magnitude & Phase.
Use the “Start Freq”, “Stop Freq” & “Data Count” values to calculate each frequency value for the first column. The two columns after the “Data” label are the real & imaginary values of the voltage measured by the TEF. Use these to calculate the magnitude & phase values of the voltage for each frequency. Each of these values will need to be scaled by the “Volts Per Reference Unit” value (mic sensitivity) to get the voltages into Pascals. Then the SPL of each value can be calculated using the “Zero dB Reference Value”.
Copy these 3 new columns (Freq, Magnitude & Phase) into a text file and save it. This file should be able to be imported easily by most all modeling programs. Hope this helps.