Buffer Size, setting DP buffer size and studio config Options

[Merlind]

Hello!

I'm using DP4.1 with a powerbook G4 1,25Ghz (1Gb RAM), plugged to a M-Audio Firewire 410 with a casio CTK-671…
My question is:
How to set the buffer size and the studio configuration in order to have no latency and other "play problem" that happen to often. I thought i wouldn't have any problem of this kind with that kind of equipment, but i'm expierencing latency when midi recording, processor overrun when using machfive with Bosendorfer soundbank…
I just want to be able to create a project with maybe 8 stereo channel, 16 mono, and some machfive and other sampler…
I'm dreaming about a chart showing all the different setting related to the equipment (powerbook, powermac, g3, g4, 800Mhz, 1,25Ghz, 512 or 1024 RAM, usb or firewire audio card…) does it exist or is somebody able to tell me at least the "good" setting for my equipment?

Thank you.