Will I lose quality when compressing?

I usually import at AAC 256kps as that setting is the best compromise between quality and filesize for me. Obviously there is a little loss of quality but hardly anything noticeable.
Now I need to clear some space on my disk. Some of my less important tracks I want to compress further, from 256 down to 128.
Question - is there any difference between...
1) AIFF > 256, then later 256 > 128
or
2) AIFF > 128 in one step
Will 1) sound worse than 2) ??
iMac G5 17" 1.5Gb RAM   Mac OS X (10.4.7)  

Christopher
Yes there is a difference. The algorithm that compress (and dumps the info) will make a pass over the file, focussing on specific areas of the sound profile. If it has already passed over the file, then the second pass will focus on those same areas again. Better to go for one pass.
Will it sound worse? These algorithms are very good, very very good indeed. So only trial and error will tell you. Definitley there will be a difference, but as to whether the difference will be noticeable depends on your playback equipment, and indeed, yourself.
So my advice is to take a few tracks that you know well and try both ways. See which you pefer.
Regards
TD

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