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]

One device, the MOTU?, needs to recieve clock and one needs to send.
I'm not sure about the card you're using but unless it can see the other device,
it may default to 'internal'. Any converter needs a stable clock and any system with more than 1 digital device needs to be clocked properly.
You'll get it figured out.
You should try and record at 44.1/24 bit. Under most circumstances it should work fine.
When you're done recording, dither to 16 bits at final mix or mastering.
best,
chap