Hello Jonetsu,
RayBlaster works completely different than other synthesizers. It generates the sound by overapping short sample bursts. Usually this is very short percussive samples or impulse responses of filters. The osc window defines which part of the sample is selected.
There are several window types available, each with its own preferred use or way to influence the sound.
The cosine window is the softest sounding one, it is a general purpose window and will be preferred especially on granular types of sounds.
Soft Saw, Exponential, Saw Down and Off are suitable for modeling the behavior of filters or beat slicing drum-loops.
For synced sounds use Off/Square or Saw Down together with the SYNC button.
Example Patches in Patch manager >Tutorial category:
HardSync, BpmSyncOsc, BpmSyncPad, BeatSlice.
Best Regards,
Markus