i recently installed adobe audition 3, for free, (thanks hueseph), i intended on revisiting some of my old 1.2 sessions for fun. so after realizing that 3.0 was able to run some newly purchased plug-insof mine i decided to try to approach an ongoing problem of mine w/ my home setup. Pro tools m-powered has always been unreliable to me not matter how i try, it's performance varies like the weather changes, i have accepted this, and don't wann bash, anything. each has their own downsides to me. So as an experiment, i imported 14 tracks into both pro tools, and audition. they happened to be multi tracked drums. w/ the sample rates the same in both programs, and the buffers maxed in pt, audition played back the tracks smoothly, which pt exhibited the familiar error message about increasing buffer sizes, or a fragged hard drive. (i disk cleaned/defragged before doing this). i was seemingly able to run many more instances of plug-insin audition as well. does this have to do w/ vst vs rtas format? their seemed to be no audible difference in the subjective quality processing. the weird thing is when task manager was open, both programs seemed to be using similar amounts of cpu, yet one wouldn't even play back 14 audio tracks (a full drum kit). they both use 32bit floating point internal processing, and at the same settings as far as sample rate/buffering on my interface, why is there such a discrepancy? even w/ no plug-insinstantiated? this is really more for my curiosity, than practical 'need' as my home setup is just for quick ideas. i used to use reaper for practicing my band material, and i didn't experience playback problems w/ about 8 stereo tracks. w/ xp optimized for audio, i wonder what is it in the software(s) that could cause this. or perhaps it's a hardware issue? my initial guess would be that the older audition just isn't taxing my cpu as much, but my question, comes in when, different software is called upon to play back the same material, w/ no other processing, why such a stark difference? thanks for any insight, just looking to expand my understanding, more than solve a specific issue.