What "LP recording" means and why you'd monitor it

LP recording refers to capturing audio from a line-in source — typically a turntable, mixer, or other external device — directly into Audacity on your computer. Monitoring means listening to that incoming audio in real time as it records, so you can hear what's actually being captured before the file saves.

People do this when they're digitizing vinyl records, connecting a mixer for live performance, or recording from audio equipment that sits outside their computer. The monitoring step matters because you can catch problems — a loose cable, a needle skip, low volume — while you're still recording, rather than discovering them after 20 minutes of wasted time.

Audacity is free, open-source recording software that runs on Windows, Mac, and Linux. It does not require you to pay for a subscription or create an account. The monitoring feature exists in the current version, though the exact menu location has shifted between older and newer releases.

Key Takeaways

  • Monitoring in Audacity means hearing your incoming audio in real time through your speakers or headphones while recording.
  • You need an audio interface or line-in port on your computer to connect external equipment like a turntable.
  • Enable monitoring by going to Transport menu > Transport Options > Audacity Preferences > Recording, then checking the "Audacity Playthrough" or "Software Playthrough" option.
  • Use headphones for monitoring during recording to avoid feedback loops and to hear the audio clearly without disturbing others.
  • Test your monitoring setup with a short 10-second recording before you start a full session.

Setting up your audio input device

Before you can monitor anything, Audacity needs to know where the audio is coming from. Open Audacity and look at the top toolbar. On the left side, you'll see a dropdown menu that says "Microphone" or shows your current input device. Click that dropdown and select the device connected to your turntable or external equipment — this might be labeled "Line In", "USB Audio Device", "Focusrite" (or whatever audio interface you own), or "Stereo Mix" depending on your setup.

If you don't see the device you expect, your audio interface may not be plugged in, or the drivers may not be installed. Unplug and replug the device, wait 10 seconds, then check the dropdown again. If it still doesn't appear, visit the manufacturer's website and read the latest drivers for your specific interface and operating system.

Once you've selected the correct input, check the dropdown next to it — the one that usually says "Mono" or "Stereo". For LP recording, choose Stereo so you capture both left and right channels from your turntable.

Enabling software playthrough in Audacity

Software playthrough is the feature that lets you hear the incoming audio in real time. The steps differ slightly depending on your Audacity version, but the principle is the same.

In Audacity 3.4 and newer: Click the Transport menu at the top. Look for "Transport Options" or "Preferences". In Preferences, find the Recording section on the left sidebar. Look for a checkbox labeled "Audacity Playthrough" or "Software Playthrough" and check it. Click OK to save.

In Audacity 3.2 and earlier: Go to Audacity menu (Mac) or Edit menu (Windows/Linux) > Preferences. Click Recording in the left sidebar. Check the box next to "Software Playthrough" or "Audacity Playthrough". Click OK.

If you don't see this option, your version of Audacity may not support software playthrough on your operating system. Windows and Mac versions usually have it; Linux support varies by system. In that case, you can monitor through your audio interface's own software or hardware controls instead.

Choosing headphones over speakers during recording

When you enable monitoring, the incoming audio plays through your computer's speakers or headphones. If you use speakers, the sound from your speakers feeds back into your microphone or line-in, creating a loop that distorts the recording. Headphones prevent this because the audio stays isolated in your ears.

Plug your headphones into your computer's headphone jack or into your audio interface if it has one. Some audio interfaces have a dedicated headphone output with its own volume knob — use that if available, since it gives you independent control over monitoring volume.

Set the monitoring volume low at first. You can always turn it up once you confirm the audio is coming through. If the volume suddenly spikes, you'll know when ready rather than damaging your hearing or the recording.

Testing monitoring before you record your LP

Start with a test: place the needle on a quiet part of your record or turn on your external device at low volume. Press the red Record button in Audacity. You should hear the audio in your headphones within one or two seconds. If you don't hear anything, check that your headphones are plugged in, the monitoring volume is turned up, and the input device is still selected correctly in the toolbar.

Let it record for about 10 seconds, then press the Stop button (the square icon). Look at the waveform that appears on screen — you should see a visual representation of the audio you just heard. If the waveform is very small or flat, your input level is too low. If it's so tall it touches the top and bottom edges, your input level is too high and may distort. Adjust the input level slider (usually to the left of the input device dropdown) and try again.

Once the waveform looks reasonable and you heard clear audio in your headphones, you're ready to record your full LP. Delete the test recording by selecting all (Ctrl+A or Cmd+A) and pressing Delete, then start fresh.

Adjusting input levels to avoid distortion

The input level slider controls how loud Audacity records the incoming signal. Too quiet and you'll have to turn up the volume later, which also amplifies background noise. Too loud and the audio will clip — meaning the peaks get cut off and sound harsh or broken.

The goal is to see the waveform reach about 75 to 85 percent of the available height on screen, with occasional peaks touching higher but not hitting the very top. If you're recording an LP, the volume is usually consistent, so set the level once and leave it alone.

Some audio interfaces have their own input level controls separate from Audacity. If your interface has a knob or slider labeled "Gain" or "Input Level", start with that at the midpoint, then adjust Audacity's slider if needed. Having both controls lets you fine-tune more precisely.

Troubleshooting common monitoring problems

No sound in headphones during recording: Check that monitoring is enabled in Preferences. Confirm your headphones are plugged in and the volume is turned up. Make sure the input device dropdown shows the correct source. If you're using an audio interface, check that its own monitoring is not muted.

Feedback or buzzing sound: You're using speakers instead of headphones, or your monitoring volume is too high. Switch to headphones and lower the monitoring volume. If you're using an audio interface, check whether its direct monitoring feature is enabled — if so, disable it in Audacity to avoid double playback.

Audio records but monitoring is silent: Some audio interfaces require you to enable monitoring in their own control panel, separate from Audacity. Check the manufacturer's software that came with your interface. Alternatively, your audio interface may have a hardware monitoring button or switch — look for a button labeled "Direct" or "Monitor" on the device itself.

Waveform shows recording but sounds distorted: Your input level is too high. Lower the input level slider in Audacity's toolbar and record another test. If the distortion persists, lower the Gain knob on your audio interface as well.

Frequently Asked Questions

Can I monitor audio without an audio interface?

If your computer has a line-in port (a 3.5mm jack labeled "Line In" or "Aux In"), you can plug your turntable directly into it and monitor through Audacity. Most modern laptops don't have a line-in port, so you'll need a USB audio interface. These cost between $30 and $150 depending on quality.

Why does my monitoring sound delayed or echo?

Delay usually means your computer is processing the audio through effects or filters. Check Audacity Preferences > Effects and disable any that are set to run automatically. Echo or double sound means both your audio interface's direct monitoring and Audacity's software monitoring are on. Turn off one or the other in your interface's control panel.

Do I need to monitor while recording, or can I just listen back afterward?

You don't need to monitor — you can record silently and listen to the file after it saves. Monitoring is useful only if you want to catch problems in real time, like a skipping needle or loose cable. For most LP digitizing, recording without monitoring is fine.

What's the difference between monitoring and playback?

Monitoring is hearing the audio as it comes in during recording. Playback is hearing the audio after you've stopped recording and pressed Play. Monitoring happens in real time; playback happens after the fact.

Can I use Audacity's monitoring with a USB turntable?

Yes. USB turntables appear as audio input devices in Audacity's toolbar dropdown. Select the turntable, enable software playthrough, and monitor the same way you would with any other audio interface. Some USB turntables have their own monitoring controls — check the manual to see if you should use those instead.