That's suggestion has made me rethink my interpretation. I was rejecting 'photoshop' applied to sound because sound is a medium that necessarily involves time,

That's suggestion has made me rethink my interpretation. I was rejecting 'photoshop' applied to sound because sound is a medium that necessarily involves time, like video, whereas a single frame 2d image has no notion or possibility of time being involved. However, in rethinking this, one could make an valid analogy of a 'photoshop filter' applied to the acoustic design of a restaurant. Given that the restaurant's layout is static, it's more like a filter on a 2-d single frame image than a filter applied to dynamic sound or video.