Yep they are stereo to 2x mono cables. I use them for hooking synths to a mixer using headphone output (the ot headphone output is much more convenient than the main outs fir instance). They can be used as insert cables if you put the stereo side in the mixer insert, then the mono end to an fx input and the other mono end to an fx output.
I use them with my tempest too, as it has 6 stereo outs, for each voice one.