https://www.dropbox.com/s/1lzbon94kb...lyzer.txt?dl=0
I've used 'VertexDSP MutliInspector Free' for a while, but this free VST isn't free for other sample rates than 44100. But I really liked the plugIn, so I did a bit of coding in Reapers JS.
I took 'Cokos Frequency Spectrum Analyzer Meter' and changed it to an 8 track Analyser.
This is not a weighted SPL meter, but it can be used to compare your tracks in mixing and see if there are any frequency conflicts.
It may come in handy for some of you.