Clicks When Recording In Dp4.12, No satisfying hardware/device settings Options

[zimpy]

Dear all,
this is my first posting, so please be gentle...

Upgraded from dp3 to dp4 on an imac g4 800mhz.
Recording voice with a usb-edirol-ua3d was fine in dp3.
But in dp4 noise appeared in recorded voices, with the same hardware/device settings as in dp3.

Messing around with buffers etc. has resulted in identifying two different kinds of noise:
'Clicks' every 5-15 seconds like a grain of sand on vinyl.
Little 'crackling' sounds, constantly, more so on top of parts with higher amplitude.
By playing with ALL the settings in 'Hardware' and 'Studio Configuration' I can either make the clicks or the crackling go away completely, but never the both of them.
Am I forgetting something, some settings somewhere, some good old trick, some preferences. Or am I to return to dp3 and OS9?

cheers,
zimpy

[chappy]

most clicks, pops and motorboating sounds are clock problems.
Ram problems will result in slower performance, crashes etc.. but usually not clicks.
Make sure that your hardware is clocked properly and that one device is the master clock.
I use an Apogee Big Ben to clock AD16x/DA16X, tc6000, 2 AD8000SE's
a digi 192 and an Apogee Trak2. Once it's all clocked, bye bye clicks.
Also, terminate your recieving devices correctly with a bnc t bar and a 75ohm terminator.
best,
chappy