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

[zimpy]

I'm only using this very basic edirol UA-3D USB-audio-capture device, no midi-devices.
I'm not sure what you mean with sequencer and sound-proofs.

Anyway, All is consistently set to edirol, and to one sample-rate.

However, there's this odd thing that in the AUDIO-pull-out menu bar most is adjustable (sample-rate, bit-depth, Hardware... and Setings...)

EXCEPT "Internal clock"; there is just no other option to choose from.

So I guess that could cause the clockproblems, indeed.

But how do I force DP4 to use the edirol-clock? Does it have a clock?
And why does audio-capture work seemlessly in OS9-DP3 and OSX-Peak?

Thanks so far,
ciao