I'm attempting, not successfully, obviously, to make a new acoustic space. I've been through all the elements required but can't seem to accomplish what I want. I want the weather sounds of SkyrimStormRainFF - which are AMBWeatherRainLight and AMBWeatherThunderDistant in an acoustic space form. The acoustic space form won't accept these, it only allows sounds from regions. There is no region, that I know that has only these sounds.

I have changed the image space of the cell to ISSkyrimStormRainDAWN_FF but this only sets the lighting. It is an interior cell which appears as an exterior. I decided not to make it exterior so to have more control of the lighting and FX.

Ideas please?