Layla20and Cooledit - Synchronzation/Latency proble - A li..

Archived from groups: rec.audio.tech (More info?)

Setup:

Layla20 (with PCI Card)
Windows XP.
MSI Motherboard with 1GB Processor and onboard Audigy AC97 Sound Card
Cooledit Pro

Task:

I'm trying to record 9 simultaneous tracks of a live band (8 tracks from
Layla and 1 from Audigy onboard sound card).

Problem:

Made a 4 hour continuous recording. When played back it is OK for a
limited time (60 min) then suddenly the tracks are seriously out of
synchronization (out of time with each other) for the rest of the
recording. The band are mad!!!

Question:

What are the possible causes of this for me to investigate?

CPU Speed / RAM Size / Disk Access Speed?
Buffer Settings in Cooledit?
Bit Rate in Layla Console or Cooledit?
The fact that I am using one of the inputs of Onboard Sound Card
simultaneously with Laylas 8 inputs?


I don't expect instant solutions but some guidance would be appreciated
so next time I record I have a chance of success.
I am willing to upgrade the PC if this is a likely culprit.

Cheers Jeff

Archived from groups: rec.audio.tech (More info?)

Kevin McMurtrie wrote:
> In article <cu457g$2jk$1@news-02.connect.com.au>,
> jottery <jottery@becsystems.com.au> wrote:
>
>
>>Setup:
>>
>>Layla20 (with PCI Card)
>>Windows XP.
>>MSI Motherboard with 1GB Processor and onboard Audigy AC97 Sound Card
>>Cooledit Pro
>>
>>Task:
>>
>>I'm trying to record 9 simultaneous tracks of a live band (8 tracks from
>>Layla and 1 from Audigy onboard sound card).
>>
>>Problem:
>>
>>Made a 4 hour continuous recording. When played back it is OK for a
>>limited time (60 min) then suddenly the tracks are seriously out of
>>synchronization (out of time with each other) for the rest of the
>>recording. The band are mad!!!
>>
>>Question:
>>
>>What are the possible causes of this for me to investigate?
>>
>>CPU Speed / RAM Size / Disk Access Speed?
>>Buffer Settings in Cooledit?
>>Bit Rate in Layla Console or Cooledit?
>>The fact that I am using one of the inputs of Onboard Sound Card
>>simultaneously with Laylas 8 inputs?
>>
>>
>>I don't expect instant solutions but some guidance would be appreciated
>>so next time I record I have a chance of success.
>>I am willing to upgrade the PC if this is a likely culprit.
>>
>>Cheers Jeff
>
>
> It sounds like many factors. Win XP isn't a real-time OS, or anything
> close to it, so there could have been an overrun in the sound buffers.
> Your recording software is also at fault for allowing the channels to
> loose synchronization after a glitch.

Thanks, any hints are welcome.
I would have thought Cooledit was relatively fool-proof.

Archived from groups: rec.audio.tech (More info?)

On Sun, 06 Feb 2005 15:07:13 +1100, jottery
<jottery@becsystems.com.au> wrote:

>Made a 4 hour continuous recording. When played back it is OK for a
>limited time (60 min) then suddenly the tracks are seriously out of
>synchronization (out of time with each other) for the rest of the
>recording. The band are mad!!!

Out of sync - how much? Milliseconds, seconds, minutes,
total disorder?

If you listen to a single track - is it contiguous?
Is something missing at one point in one track or
is a part repeated?
>

>Question:
>
>What are the possible causes of this for me to investigate?
>
>CPU Speed / RAM Size / Disk Access Speed?

If disk access speed would be a problem you should miss a
couple of notes in some or each track.

One hour of 9 tracks at 44.1 kHz 16 bit would make up a file
size of 793,800 bytes/sec which will result in 47.628 MB/min
and 2.8 GB/h. I would suspect a problem at the 2 GB and 4 GB
watermark of the file system, corresponding to 43 minutes
and multiples thereof.

Another problem might be that Windows XP from time to time
cleans up its swap files. Having that on the same disk drive
along with the temp files of CoolEdit will result in very high
demand of the disk - loss of data in some or all tracks.

For more help we need to know more of your setup, such as
size of disks, size of partitions, position of swap file,
position of temp files of CE and such.

We need to know more on how the timely disorder looks like,
lost or repeated blocks in one or more tracks.

Norbert