Records at high speed

Excellent, all good so far :smiley:

So what exactly are you trying to record? Please be descriptive because I can’t see your set-up.

I am recording LPs. My phono preamp feeds the Line input on my SB Live! soundcard. I have been using this setup for several years, but in the past using Audacity with Windows XP. The problem exists only with the Linux version of Audacity.

Cool. Let’s find out where it’s going wrong.

Connect up your equipment and start playing a record, then open pavucontrol and look in the “Input Devices” tab.
If necessary, try selecting different option for the “SB Live! EMU10k1 Analog Stereo” device until you find the one with a meter dancing to the music.
A screenshot at this point would be good.

Screenshot.png
The only inputs that work are the aforementioned SB Live! Line:0 input and spdif: Line:0
The info in the screenshot is the same for both inputs.

The screenshot doesn’t help much :wink: but I presume that you mean that when you select “SB Live! Line:0 input” as the recording “Port” for the SB Live! EMU10k1 Analog Stereo Device you can see the meter moving with the music?

Open pavucontrol and ensure that “SB Live! Line:0 input” is set as the recording port.
Close pavucontrol.
Open Audacity and set both the Recording Input and the Playback output to “Pulse” and set the number of channel to “2 (stereo) Input Channels” in the device toolbar.
Start your record playing.
Press the Record button. You should see the waveform being recorded.

Record a short section, then press the Stop button.
Press the Play button. How does it sound?

If the sound is still breaking up, please post a short sample in WAV format to demonstrate the problem. Just 2 or 3 seconds will be enough.
See here for how to post audio samples to the forum: https://forum.audacityteam.org/t/how-to-post-an-audio-sample/29851/1

Screenshot.png
The choices for the port are: Microphone/Microphone 1
Microphone/Microphone 2
Line in
Analog Input
Video
As shown in the attached screenshot, I have selected Line In

With Audacity set for an input of Pulse: Line;0 and an output of Pulse, no recording occurs. As mentioned previously, the only working inputs are SB Live!---------------Line:0 and spdif Line:0

Was the meter below the two sliders moving with the music?

I assume the meter is the unoccupied bar below the sliders. There is no movement there with the audacity input set for pulse line:0. There is also no movement even when a recording is occurring with with the Audacity input set at Live! Line:0. The audacity meters show no input at pulse Line:0, and show normal activity at Live! Line:0.


Here is an example of the problem.

I wrote:

You replied:

I wrote:

You then wrote:

We clearly have a communication problem and I can’t see your computer, so I’ll have to defer to someone else.

I agree. Apparently I am unable to convey to you an accurate description of the problem, thereby resulting in a series of tests that had nothing to do with the original problem.

So you now believe the pitch is correct, and the waveform is short because of the dropouts. Is that so?

How did you record the test tone? With a cable from audio out to line in? Or some other way?

I assume you are aware that Creative never intended SoundBlaster to be used on Linux. Have you asked on the Linux Mint Forums what would be the best community-made drivers for it? I don’t see any drivers listed for it at Matrix:Vendor-Creative Labs - AlsaProject . Or is it a USB-connected Live 5.1?

If dropouts are the problem, please review: Missing features - Audacity Support for possible causes.


Gale

Gale:

Yes, I believe the pitch is correct. The entire waveform appears to be compressed in time, and I have no idea what’s causing the dropouts. The sound is more like what you would hear if the phono stylus skipped grooves while playing.
The test tone was generated by the tone generator in Audacity “Test” “Tone”.
No, I was not aware that the Sound Blaster card was not to be used on Linux, and I will check into the Linux Mint 15 forum for help. The card seemed to work fine once I found the Line Input control in alsamixer. I might mention that I just discovered Audacity V. 2.03.1 is the version installed by Linux, and I believe that version is no longer supported.

But if you recorded it the same way as you record the vinyl, why does the tone not record with dropouts?

I know people who use SoundBlasters on Linux without too much issue, but you may find the PCI SoundBlasters temperamental if they don’t have a Linux driver. The USB SoundBlasters are probably more compatible on Linux, as a broad generalisation.

To get the latest Audacity 2.0.5 release as a package you may need to update Linux Mint.

You can also install the PPA (basically an Ubuntu “daily updated” package of latest Audacity code, so that is actually 2.0.6-alpha at present): LinuxG - The Ultimate Guide to the Online Casino India 2023 .

Most users probably don’t want to install the PPA because it is not a “released” version, and I suspect the Audacity version is not relevant to your skipping problem.

Something as simple as an excessive project rate (try 44100 Hz or 48000 bottom left of Audacity) or some application hogging the CPU could be the cause.


Gale

I did not record the test tone in the same manner as vinyl. The tone is generated by Audacity, and I don’t know the my sound card is even involved in the process. No cables are used, nor is any control used to adjust the recording level.

I keep Linux Mint updated on a daily basis. As of today, only Audacity 2.03.1 is offered.

I’ll hold off on the PPA for right now.

I tried changing the project rate from 48000, which seemed to be the default, to 44100. If there was a difference I couldn’t hear it. I can try some other rates tomorrow. My first thought was that recording was occurring at one rate and playback at a vastly different rate.

Linux Mint 17 “Qiana” (LTS) has Audacity version 2.0.5.

Then you didn’t record the tone. You generated it, but then did not record its playback.

You may be keeping Linux Mint 15 updated, but the current Linux Mint Version is 17.

It’s possible Audacity 2.0.5 on Mint 17 can’t import and export WMA, M4A and other FFmpeg formats. Do you know about that. Steve?

If you experience dropouts at standard rates like 48000 or 44100 Hz then you probably need to look farther afield for the cause of the dropouts.


Gale

Uninstalled Mint 15.
Installed Mint 17
Installed Audacity 2.0.5-1 ubuntu 3
No change, problem remains. Enough frustration - I’ll use Audacity in Windows XP.

That’s no surprise. We said the Audacity version probably wasn’t relevant.

Be careful, because Microsoft probably won’t be updating Windows XP further for bugs or security issues.


Gale

Steve and Gale:

Many thanks for the help.
I had hoped to completely rid myself of Microsoft, but I guess that’s not to be. I must have my Audacity.