Please check my test [OK]

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Post by Murphy8104 » April 16th, 2020, 5:20 am

Please check my test audio and let me know what to do next. Thanks.

Username: Murph8104
Software: Audacity - WIndows 10 - USB connected microphone

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Post by taylutian » April 16th, 2020, 2:05 pm

I think that your audio was perfect. You put emphasis on just the right words and went at a good pace. :D

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Post by knotyouraveragejo » April 16th, 2020, 4:53 pm

The purpose of the 1-minute test is to check that the technical settings are what we need at LibriVox.

1. This file is in stereo LibriVox files need to be mono. For future LibriVox recordings, you can set Audacity to record in mono under Edit - Preferences - Devices - Recording - Channels - One

2. This file was exported as a 192kbps variable bit rate mp3. For LibriVox, you need to export as a 128 kbps constant rate mp3 file. In Audacity, you do this when you export the file. Under File - Export - Export as mp3. In the window that pops up, choose the following Format Options: Bit Rate Mode - Constant; Quality 128 kbps; Channel Mode - Force export to mono. add .mp3 to the filename. If you correctly export to mp3, the software will do that for you.

3. The volume on this recording is a little below our target range. (85.db). We aim for 89 db with an acceptable range of 86-92 db. Please try increasing the mic input volume either in Audacity or in the Sounds and Audio section of the Control Panel. This adjustment will also help increase the signal to noise with regard to the background.

To judge whether you have the volume set correctly, your waveform in Audacity should look similar to this example:


Detailed instructions for adjusting your input levels can be found here:

You can download the checker program to check your volume after exporting to mp3 and before you upload your file.

If you prefer you can use the Replay Gain plugin in directly in Audacity to tell you how much your file needs to be amplified to get to 89 db. Instructions here:

If you can't adjust your input volume to reach the target 89 db, then, you will need to use the Effect:Amplify to actually amplify the file. Important: be sure the box to allow clipping is not checked! Amplifying will also increase the background noise along with the rest of the recording.

Once you make the above adjustments you can consider using lthe Noise Recudtion Effect in Audacity to tone down the background hiss.

Please make the above adjustments and upload another test. Just post the link to this same thread to keep all your tests together. :)
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Post by Murphy8104 » April 17th, 2020, 6:19 am

THank you both for your review. I've made the changes suggested by downloading AUdacity 2.3.3 to a different laptop and altering the required settings. I've uploaded the revised file (link below) for your feedback. Please let me know what to do next. Thanks very much. Lisa


1. Recorded in Mono

2. Exported as 128 kbps constant rate mp3 file.

3. Volume increased through Amplify command
4. Applied Noise Reduction

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Post by TriciaG » April 18th, 2020, 9:13 am

Test is good now!

Volume is good. Don't go any higher, though. ;)

You're all set. Have fun!
Mystery/PulpFic: Dope, by Sax Rohmer
The one that started them all: Self-Help, by Samuel Smiles
Elizabethan Poetry: The Psalmes of David
Boring works 30-70 minutes long: Insomnia Collection 5
Short essays: Elia, and The Last Essays of Elia

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