Better VU meter soon?

[RackedBrain]

See this link. I use the Klanghelm Vu meters, also.

Strategy for adjusting part volume song-to-song

So this is probably overthinking a simple question, but what’s the most common strategy for changing an instrument’s volume from song to song? For example, I have all instruments defined as linked racks. On one track the piano’s more forward in the mix, but in the next song I want it to be background so the volume should be lower. Manually adjust with faders? Bind the song to different plugin gain levels? Create different states of the same instrument for background vs. lead? Thanks!