Is this a bug? Time Pitch Machine Changes Gain Levels

Logic Pro 9.1.4, macpro dual quad 2.93mhz, osx 10.6.8
i'm altering the 'speed' of some of my 88.2khz aif files by a very small amount using Time and Pitch Machine, in Classic and Free modes ( -1.3% / -22cents apprx)
but to my surprise i noticed that the levels of the file dramatically drops after a process.
i expected some minr changes as its altering the length very slightly - but in the process i'm losing a great deal of level.
eg: one original file that as un-normalised has a gain of 56.41% ( - 4.94dBu aprx), has dropped after the pitch change to 27.66% (-11.16dB) !
thats a major loss of levels, and looks to be half of the original.
can somebody explain if this is a fault?

Well, the 44.1 test is just a test, you don't have to destructively convert your 88.2 files, just use 44.1 converted copies. I do agree that the drop in gain seems too much. It could well be that it is a bug related to the sample rate, so that's why I proposed the test. As for fidelity, you really do not loose much (if at all, audibly) when going from 88.2 to 44.1. Going from 24 bits to 16 bits at 88.2 will have a much greater (negative) impact then going from 88.2 to 44.1 at 24 bits.
24/44.1 is much better than 16/88.2.
Simple rule: if you can't hear the difference (test it blind! using ABXer http://emptymusic.com/software/ABXer.html
(not sure if it is SnowLeopard compatible though... my Intel Mac is unavailable right now, typing from my old PPS G4 on Leopard)
And, if you simply leave your original 88.2 files intact (use copies), you can experiment and listen without discarding your original highest resolution recordings.

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LE does have the Enhance Pitch plugin, that I often use. It has 2 controls: how fast it responds, and what scale it uses (or chromatic). Works quite well! Much easier than the Time&Pitch machine or the Pitch Shifter plugin.
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this happens with imported loops (aiff), loops created with audio instruments as well as loops recorded via external gear.
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Message was edited by:
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