...after 4 Days of heavy testing with 4 times reinstalling OS X etc., latency checks, 24 bit sample converting to 16bit, tuning OS X to energy max etc plus several phone calls to Ableton Support (thanx guys, you are great !!) and no change in audio glitches between different scenes here comes the solution:
i had to divide my Live-Set in to two pieces, i.e. i will have to load a second set after having played my 1st hour of my 2 hour Live PA.
In the original set w/about 2 GB of samples and 450 scenes w/numerous clips the activity monitor under OS X showed 600 MB of RAM plus 1,6 GB of virtual RAM. After splitting my set, both halves give a pair of 218MB/520 MB RAM/Virtual Memory and all scenes work with no audio glitches.
..the only thing left is the possibilty to upgrade my internal RAM for about 300 Euros..and i will have to find something in between my two halves...mayby i gonna tell a fairy tale over the mic
cheers and peace and more RAM,
Dr.Scissors
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Alu PB, 1,5Ghz/1GB RAM 80GB HDD, hammerfall DSP, MT4, 120GB Firewire/400, Faderfox, Pocket Dial....