Context: On Tiktok, there is a filter with which your face turns blue and deforms several times. This filter is accompanied by music which becomes lower-pitched music every time the face changes. Is the following description grammatically correct? it is the filter accompanied by music from high-pitched to low-pitched. It sounds like terrible English to my ears.
You could try this:
"Each time the filter changes the appearance of your face, there is accompanying music that decreases in pitch."
Another possibility, which is a little more evocative, could be, "Each time the filter changes the appearance of your face, there is accompanying music that winds down in pitch."
This would indicate that every time you hear the music, it starts high and ends lower.
Both make sense to me as a native English speaker.
Here's what might be a useful distinction for you. If, instead, you mean that the first time you hear the music, it's pitched in one range or key, the next time you hear it, it's pitched in a lower range or key, and so on, you might say:
"Each time the filter changes the appearance of your face, the pitch of the accompanying music is lower."