So as I look around. I realize that I want (another) preamp that will sync to an external source. Preferably SPDIF(coax) but since we are at it, might as well include all of them..Opti, WC & AES. What it needs to be able to do is to accept an external signal for clocking and still use the analog inputs( mic) for it's sound source. MUST OUTPUT DIGITAL( I am looking for SPDIF coax). I know the Sound Devices USBPre2(SPDIF coax/opti will, I've used it. from what I gather reading @ Tascam site, The US-600 & US-800(SPDIF coax) will set their rate according to incoming rate. Same with the Apogee AD-1000( SPDIF coax, WC, AES)...And I assume the AD-500? Lunatec V3(WC) What else are you guys using that fits these parameters? Thanks in advance for your input.