Convert audio to keyframes just takes the levels - not the loudness but the value shown on a VU meter and converts that to a number with the same range as the VU meter. The VU goes from -24 to 0, or traditionally for analogue from -12 to +12. The range range for audio keyframes goes from zero to 50 so using the digital VU meter markings a value of -10 will give you a keyframe value of 20.
You can see the numbers in the graph editor:
Thanks a lot Rick, thats brill, can I ask how you know the range is 1-50 ? or where is there information on that . . .?
I know because I tested it out with some audio long time ago.
Record a tone at 50%, record another town at 100 or zero DB and check it out for yourself.
Just going to do that right now. Thanks for being so helpful. Posted your answer over where I was discussing it originally too.
I am trying to script something to give a LUFS reading for audio in AE - doesn't have to be perfect, so now I am getting reasonably accurate figures, but still testing, now that I know the range translation.