Figured out the multrack thing : not only it needs to be 16 tracks of 96khz wav files of the same filesize , it also has to be 24 bit . Anything else won’t work . Audacity seems to be the way to resample , I use studio one as a daw but when I resample to 24 bit in studio one the files are recognized as 16bit in windows and not played the sq5 ,only audacity sees it as 24 bit : don’t know why ..