Please update to the latest spice2x. You are using spicetools from 4 years ago. You need to update, and try again.
https://spice2x.github.io/
also, "-iidxsounddevice dsound -audiobackend waveout" is not valid.... You can't set iidxsounddevice to dsound, and setting audiobackend to waveout will not work, so you should clear both options and just normal wasapi in spice2x.
It's already fixed last month... please read the giant warning on https://spice2x.github.io/