I suggest testing your old digidesign 002/003R/003R+ with the latest Linux kernel ALSA firewire sound driver. Apparently the clicks and pops are gone!
The tree is not quite merged into mainline kernel but you can get it from here with the right changes:
- git hash 82b954a96c1550bae2cb1f1f4f084425ab237cd7 (or newer)
Here is a link to at least one report of it now working:
Thank you Takashi S for your work!