Rain is the most requested layer in lofi for a reason: it is broadband, unpredictable at the micro level and completely predictable at the macro level. It masks the room without asking for attention.
Open a rain room Listen nowMost rain lofi is a music track with a rain sample on top. Here the rain is in the picture: rain on the train window, rain over a cabin roof, a greenhouse with water running down the glass. The visual gives the sound somewhere to live.
The important detail is that the interior stays dry. Water only exists outside the glass, which is what makes the room read as a room rather than a filter.
Night train is the most requested: rain streaks on a moving window, a warm lamp, almost no visual motion. Snowfield is the quietest of the set; greenhouse is the brightest if you are working during the day.
No. The rain lives in the scene; the audio is a normal lofi rotation. That keeps the music from sounding like a sound-effect bed.
Not currently — every room ships with its music family.