A drones & soundscapes sound effect, generated with audiocpp-stable-audio-3-sfx from the prompt below. Copy the prompt, change a word and generate your own version.
pure low frequency rumble bed with no midrange or top, slowly undulating, felt more than heard, seamless loop
Generated with audiocpp-stable-audio-3-sfx. These models respond to material, action and space, so the most useful edit is usually swapping one concrete noun for another.