What is the best sample rate to use with a Delta 192 synced to a delta 66? (Asus P5 board, Windows XP 32 bit S.pack 2, 1.6 clock speed Intel core duo/chipset, 3GB RAM, Cubase Studio 4) Would using just the Delta 66 for audio and a separate USB MIDI interface be significantly better - in terms of lower buffer settings/latency?

SOURCE: please advice on sound card to run cubase ?

Download ASIO4ALL

SOURCE: midi sport 2x4 usb midi interface

i have no sound drive in my system so please permit me 2 download sound drive from ur product please grant me 2 download

SOURCE: Do not get MIDI signal via EDIROL UA25

just try wit another version of the driver if there are any available... can you please giv the details about your machine.... wats the model number

SOURCE: popping and clicking in delta 1010 playback

frequency response: 20Hz-22kHz, +/-0.3dB dynamic range (A-weighted): 109dB (A/D), 117dB (D/A) signal-to-noise ratio (A-weighted): -109 dB (A/D), -117dB (D/A)

I found these on the site, seems you have the khz way too high.
All good.
Here's the link to your site.

SOURCE: recording on cubase le4 using my tascam us122 mk2

You're probably not recording through your tascam interface. Go to control panel -> sound, and then select the us122 as your default sound device. Close cubase and open it again. Then go to devices -> device setup, and then under your asio drivers, select asio us122. That should solve it