The tests I've been doing have been a signal generator on an Aux track, bussed out to an audio track bus input and recording various numbers of tracks. Everytime they are not audible while tracking, but definitely afterwards in playback, and viewable in the waveforms. The glitches appear after some time, between 20min to an hour of constant recording, and are then consistently appearing a little more than every second. I've done several tests, driver updates, drive swaps, HD card slot swaps, bios updates, overclock, underclock, etc, and can't track it down. While I was prepping the CD, I noticed after about 30 min of recording, glitches appeared in the recording, viewable in the waveforms, that were DEFINITELY not audible while tracking and monitoring the recording. He left and was to come back the next day after I compiled a CD of takes and versions. Always rolling and not stopping record unless he needs a break. Comes in, plays for about an hour or 2 non-stop while i'm just recording and taking notes. I noticed this because a regular client I've had for years came in for a regular session, first one on this new mobo. I haven't installed the card yet, so it's still HD1. I've been using an HD1 and recently changed a motherboard to accommodate another Accel card on it's way. Sorry for resurrecting this about a year later, and sorry for the long post coming. I realize that this may be a hardware issue but thought I'd share my experience here to see if anyone has seen anything like this. I've also checked and re-checked cabling to make sure my 192IO connection to my core card is secure. I've run DigiTest on both my core and accel card (both passed). No other sync or digital devices are being used. The problem is sporadic and unpredicatable but once it starts it tends to happen more frequently. The ticks vary in amplitude but at times seem evenly spaced with no relation to the session tempo and if I immediately re-record the section, I get a clean recording. It sounds very similar to a clocking issue, except that here, I have only one 192IO and it is clocked internally. During recording, audio sounds fine but upon playback, gltches sometimes appear in the audio (zooming in on the waveform also shows the glitches and spikes). This is a new issue that has started after upgrading to PT 7.4/7.4cs1.
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