Sound Check (Gravity)

This is a song about a person who's in a bad relationship and is afraid that their bf/gf is going to leave them.

Gravity - I feel this word is being used to describe the attraction both people have towards each other. They were drawn to each other from the start.

Never let me down gently - Letting someone down gently is a common way that people refer to breaking up with someone that they genuinely care about and, as such, don't want to hurt by telling them that they want to end the relationship. The speaker is telling the person to never let them down gently, or in other words, "don't try to spare my feelings by not telling me right out that you don't think it will work between us."

Never let me go no no - Simple in the context: please don't leave me.

The next two lines seem to suggest that one or the other is in denial about there being a problem in the relationship.

I don't pull me down on me - I don't put pressure on myself by putting ridiculously high standards on how I'm supposed to live or act.

I don't pull me down on you - I don't put my own insecurities on you either.

Also, the indecipherable parts suggest a recurring argument between the two, as if they're just not understanding or hearing each other.

Which brings me to my last point, the name of the song.

Sound Check (Gravity) - It's as if the main speaker were trying to suggest that the main problem, the fact that neither is listening to the other effectively, is going unheard and being ignored by both parties. Coincidentally, most people only remember the part of the name "Gravity" which isn't even the true name of the song! In a strange way, it illustrates perfectly that when one is in a bad relationship the negative tends to get ignored and communication tends to suffer more and more as the relationship is nearing it's end, until the final words of the last fight are all one hears and the relationship is broken off.

Of course the idea about this just being about the force of gravity is an interesting thought as well.