A Really Bad Nightmare, LAP gradually decreasing in performance Options

[chili]

HELP!!,
i am having major problems with logic audio 4.7.3(yes,yes,i know i should have made the upgrade to at least 5 by now-will soon- but is a question of dollars.)

i used to be able to run up to 48 audio tracks with up to 40 plugins going without a hitch, but over the last couple of months this performance has gradually decreased to avrage out at 15-20 audio tracks and starts stopping after just a few plugins(like 1 x autotune,1 x voxciter,,2xcompressors and a few fat eq's) i am running oS9.1 /G4 450mhz/512m ram/10g hd internal(for apps)30g internal hd for audio and an external momobay 120g firewire for backups. with a digi 001 as my audio interface and a motu midi interface.i defrag my drives weekly and run nortons regulary as well...am completely stumped after doing a total reformat of drives and clean installs of my oS and Logic software
can anyone help???

cheers,
simon.
also a secondary thignyprob noit in this topic but--i cant get a digital signal in from the digi 001 to logic audio-they dont seem to talk to each other that well any clues for drivers or extensions??

[chili]

hi,
am running 9.2...just decided to bite the bullet and upgrade my machine instead of trying to solve problem(suspect its dust in the boards as my room is dusty and old).
thanks for the tips on ASIO drivers tho'
cheers,
simon