I expect it to be 1 at a time, like Ribbons. The 4-track looper can be used with the touch modes on the newest update to Ribbons, but that’s because the looper is still separate from the touch modes: you can’t use 2 touch modes on Ribbons at once.
Jaak mentioned above that it is similar to the reverb in Ribbons, which is unique but loosely based on rack reverb units. As far as I know, it can be used alone without the exciters going, so you can use it as a standalone reverb.