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How to avoid lag when recording a new track

 
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ranbo



Joined: 10 May 2011
Posts: 2

PostPosted: Tue May 10, 2011 1:33 am    Post subject: How to avoid lag when recording a new track Reply with quote

When I record a second audio track, there appears to be a 23ms "lag" between the two tracks. To test this, I recorded some clicks on the first track, then played those through the speaker while recording the second track. About 1ms of lag can be attributed to the speed of sound between the speaker and mic. But the rest is probably some sort of processing/USB/whatever lag.

Some amount of lag is probably unavoidable, and, indeed, it's not as bad in Amadeus Pro as in Audacity (150ms lag there). However, it also seems like the software could have a setting that allows newly-recorded tracks to be automatically shifted back by a fixed amount (or have sound going out the speaker play that much "early" compared to where the recorded samples are being stored). Even cooler would be for the software to play some clicks and "listen" to the response, and auto-calibrate.
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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Tue May 10, 2011 4:03 am    Post subject: How to avoid lag when recording a new track Reply with quote

I am assuming you are using a USB device -- there will be delays due to
the input buffers on both the output and the input.

Chuck

On 5/9/11 8:33 PM, ranbo wrote:
Quote:
When I record a second audio track, there appears to be a 23ms "lag" between the two tracks. To test this, I recorded some clicks on the first track, then played those through the speaker while recording the second track. About 1ms of lag can be attributed to the speed of sound between the speaker and mic. But the rest is probably some sort of processing/USB/whatever lag.

Some amount of lag is probably unavoidable, and, indeed, it's not as bad in Amadeus Pro as in Audacity (150ms lag there). However, it also seems like the software could have a setting that allows newly-recorded tracks to be automatically shifted back by a fixed amount (or have sound going out the speaker play that much "early" compared to where the recorded samples are being stored). Even cooler would be for the software to play some clicks and "listen" to the response, and auto-calibrate.




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ranbo



Joined: 10 May 2011
Posts: 2

PostPosted: Tue May 10, 2011 4:09 am    Post subject: Reply with quote

Quote:
I am assuming you are using a USB device -- there will be delays due to
the input buffers on both the output and the input.


Yes, of course. But if the delays are consistent--and they do seem to be--then it should be possible to automatically move all recordings back by that amount (23 ms in my case) so that I don't have to do that manually every time I record.
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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Tue May 10, 2011 4:35 am    Post subject: How to avoid lag when recording a new track Reply with quote

It seems possible if the program knows it using doing multi-track
recording and if it knows the time is the same. (I think in many cases
you can change the buffers). Of course, you could just create an action
that inserts 23 ms of silence into the appropriate track at the
beginning and be done with it.

Chuck

On 5/9/11 11:09 PM, ranbo wrote:
Quote:
Quote:
I am assuming you are using a USB device -- there will be delays due to
the input buffers on both the output and the input.

Yes, of course. But if the delays are consistent--and they do seem to be--then it should be possible to automatically move all recordings back by that amount (23 ms in my case) so that I don't have to do that manually every time I record.




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