Ascii text file with integer sample values in base 10. Samples are deliminated by either , (ascii no 44) or new-line (ascii no 10). Comments and lines not containing sample values must begin with a ; or a %.
For stereo files (with interleaved samples), you must manually set stereo in the waveforms properties box source tab.
;signed 8-bit, 3 samples 127; first sample -3 15; last sample
% This will be detected as unsigned 15-bit, 5 samples 9,0,32767,1000,20001