Digital Spike source?

[jcolagross]

I go into PT 8.04 through an Apogee AD16x, with PT clock set to ADAT, so I am using the AD16's Big Ben clock, then I come out into a Rosetta using S/PDIF. I was recording last night and getting periodic digital spikes (pops). What is most likely the problem?

[miketeachesclass]

Originally Posted by jcolagross

I go into PT 8.04 through an Apogee AD16x, with PT clock set to ADAT, so I am using the AD16's Big Ben clock, then I come out into a Rosetta using S/PDIF. I was recording last night and getting periodic digital spikes (pops). What is most likely the problem?

Post a sandra report (you can find more information in the "Help us Help You" thread), and more people will likely chime in.

Also, search the board for "clicks and pops". This is a recurring issue. You might find some suggestions there.

[jcolagross]

Thank you.

[albee1952]

If you change the digital source from optical(ADAT) to SPDIF, you need to also change the clock source. In any case, all devices must work off a single master clock. Which interface you have will determine how that gets done.

[jcolagross]

Originally Posted by albee1952

If you change the digital source from optical(ADAT) to SPDIF, you need to also change the clock source. In any case, all devices must work off a single master clock. Which interface you have will determine how that gets done.

I assume the Big Ben in the Apogee AD16X is the way to go. So, in ProTools I select clock source as "ADAT", since I am using a 002R, right? S/pdif is being or the D to A (Apogee Rosetta 200). I think ADAT is the only way for me to get the 8 channels in digitally from the AD16X. Thanks for your help Albee. You were the one who helped the most last year when I was building my computer. (You and Guitardom)

[albee1952]

You are most welcome(and guitardom is the best)

[jcolagross]

Originally Posted by albee1952

If you change the digital source from optical(ADAT) to SPDIF, you need to also change the clock source. In any case, all devices must work off a single master clock. Which interface you have will determine how that gets done.

My signal flow now is pres to Apogee AD16X then ADAT lightpipe over to DIGI002R, then out to Apogee Rosetta by way of S/PDIF. The session is 44.1/24bit. (I made sure the DIGI, AD16X and Rosetta all match this.)In ProTools, under "setup" and "hardware", I set clock source to "ADAT". Is there any step I am missing? Anywhere else I need to choose the clock? I tried swapping the clock from internal, to ADAT, to S/PDIF and I get the digital artifacts (small digital pops, not big spikes, just audible enough to ruin the recording. I'll work on the Sandra. As a side note, possibly related, when I bring up the Virtual instrument "Mini Grand", when I hold a chord, it cuts off after a second or two. It's never done that before. I don't know if these are related problems or not. Thank you

[albee1952]

Originally Posted by jcolagross

My signal flow now is pres to Apogee AD16X then ADAT lightpipe over to DIGI002R, then out to Apogee Rosetta by way of S/PDIF. The session is 44.1/24bit. (I made sure the DIGI, AD16X and Rosetta all match this.)In ProTools, under "setup" and "hardware", I set clock source to "ADAT". Is there any step I am missing? Anywhere else I need to choose the clock? I tried swapping the clock from internal, to ADAT, to S/PDIF and I get the digital artifacts (small digital pops, not big spikes, just audible enough to ruin the recording. I'll work on the Sandra. As a side note, possibly related, when I bring up the Virtual instrument "Mini Grand", when I hold a chord, it cuts off after a second or two. It's never done that before. I don't know if these are related problems or not. Thank you

Given this signal flow, I think the Rosetta needs to be set to clock to the incoming SPDIF(from the 002r). I was thinking you had IN-coming audio on both optical and SPDIF. As I re-read this, I bet you were not aware of the 8.0.4 bug where Pro Tools reverts to internal clock on every system boot That's right, since then(and with PT9) you need to reset the clock source after every boot.