A low, rumbling growl, starting softly and gradually increasing in intensity over a few seconds, then slowly fading back to silence. The rumble should be continuous, not punctuated by distinct "gurgles." The sound should be relatively deep in frequency, with a slightly hollow resonance, suggesting the emptiness of a stomach. There should be a subtle variation in pitch and volume throughout the sound, mimicking the natural irregularity of a real stomach growl. The overall quality should be clean and realistic, avoiding any artificial or metallic-sounding artifacts. The length of the sound should be approximately 5-7 seconds. The sound should be suitable for use in a variety of media, including film, video games, and animation, without sounding overly cartoonish or exaggerated.