upgrade to record audio

powermac g4 (agp)
cpu typeower pc g4(2.9)
number of cpu's: 1
cpu speed 450 mhz
L2 cache(per cpu):1 mb
memory: 896 mhz
boot rom version: 4.2.8fl
serial number: xb0240r5jj2
sales order number:M7628LL\A

how do i go about updating this computer to run the latest applications
such as pro tools le studios? As far as audio recording and producing.

can these computers be used as recording rigs or are they to outdated? what would i need to upgrade to run a better operating system and at least pro tools 7