GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Didital Things
In the Thread: Pacific Microsonics Model 2

Post Subject: Can software be slaved to firewire device?Posted by manisandher on: 9/28/2009

Romy the Cat wrote:
If you do not have the same effect as reel tape of 15ips played at 9ips then your software is not truly slaved by Pacific/ AFI1 chain.

Yes, I totally agree.

And I can indeed replicate this effect... but only with my RME FF800 and not with my Weiss AFI1.

With the FF800 (slaved to the Pacific), changing the Pacific's wordclock does indeed change the speed of any audio/video being played. (Going further, using the FF800's internal Direct Digital Synthesizer (DDS) clock, I have 'total' control of the speed of audio/video.)

This suggests to me that software can indeed be slaved to a firewire device.

However, I cannot replicate this effect with the Weiss AFI1. Here, the player/recorder software seems to dictate the frequency. If the frequency down the chain (with the AFI1 or Pacific as Master) is different to that of the software, then there is simply no sound produced.

Romy the Cat wrote:
Anyhow, to mimic the problem that I describe do the following:

I will try this, but will need to wait a few weeks until I move into my new house and have my turntable set up.

For now, I have tried to hear a difference in the sound by simply unplugging the second AES/EBU cable whilst listening to a 44.1/88.2 file in single-wire mode. I'm not sure how closely this replicates step #10 of your procedure, but I cannot hear a difference (in either level or sound quality) with the second cable in or out...

Have I totally misunderstood the issue here?

Mani.

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