Noise Removal in a Chain

[magarlick]

Dear all

I am new to Audacity. I just downloaded the latest version 1.3. I am trying to digitize my vinyl records. I have read the excellent sample work flow given in the help, and now I am trying to create a chain so that I can do it automatically. But there seems to be a problem with the Noise Removal. When I add this into the chain, the Parameters section is empty.

I edited my parameters anyway, then saved. Closed Audacity and opened it again and looked at my chain. Opened up the Noise Removal, and the parameters had been reset to the default.

I am confused by this. Does it mean that I need to set the noise parameters each time I open Audacity? Will the Noise Reduction actually work in the chain?

Thanks for any help.

[steve]

Noise Removal is not well suited to using in batch processing.
Noise Removal attempts to remove a "noise profile" from the audio. The better the noise profile matches the actual noise in the audio to which it is being applied, the more effective the noise removal will be. If the noise profile does not match, then the Noise Removal effect will remove the wrong sounds and will cause damage to the audio and not remove the noise.

If you have a number of files that have very similar noise, then you can use Noise Removal in a chain, but you still need to give the Noise Removal effect a suitable noise profile before you run the chain. To do this, Import one of the audio files into Audacity and manually use the Noise Removal effect. Try and choose a "typical" file for doing this, and spend a bit of time tweaking the parameters to get a reasonable amount of noise reduction with the least amount of wobbly metallic artefacts or other damage.
The Noise Profile will then be retained until you close Audacity, so you can now apply the Chain to the remaining files and it will use the current Noise Removal settings.
When Audacity is closed, the Noise Profile will be reset.

[magarlick]

Thank you. It's just confusing that the parameters are not listed in the chain events.

Cheers.

[steve]

The Chain feature is currently quite limited, but we're hoping for further development of this feature after the release of Audacity 2.0.