In making sound files, I want to label different variations of the same sound that have different levels of stereo enhancements, one for being when the effect sounds more mono-channel and the other for when the effect sounds very diffused on either side, and one for in between these two.
Is there a convention of terms to describe different levels of stereo enhancement? Like close, mid, far; or spread, centered, mono; or anything like that?
There are no standard conventions for this. You are free to use whatever labels you like. I would, however suggest that we continue to use the term "monophonic" for a stereo signal where the difference component is zero.
Enhancement just adds to any existing stereo phase correlation. So you can’t measure how much a recording was enhanced unless you have a copy of the same recording before enhancement, but you can measure the absolute stereo spread of a recording using a stereo phase correlation meter.
See: https://www.soundonsound.com/sound-advice/q-what-are-my-phase-correlation-meters-telling-me?amp
So in simple terms, a correlation meter reading of +1 means that it is receiving a (dual) mono signal, whereas a reading of zero means a fully wide stereo image. Normal stereo material will generally display a fluctuating reading between +1 and zero. If the reading trends towards the +1 end the image is getting narrower and heading towards mono, while trends towards zero indicate a much wider image.
