Sound adverbs are provided in this article. The words listed here are commonly found along with the verb sound in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb SOUND.
absolutely, actually, apparently, awfully, certainly, completely, differently
entirely, environmentally, equally, especially, exactly, extremely, fairly
financially, generally, hardly, harshly, highly, incredibly, loudly
nearly, necessarily, oddly, overly, particularly, perfectly, positively
probably, really, remarkably, simultaneously, slightly, strangely, suspiciously
terribly, totally, usually, utterly, vaguely
Hope this word list had the sound adverb you were looking for. In addition to adverbs used with sound, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.