Recording an LP with Audio Evolution 4

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Tutorial for Audio Evolution 4 - Transferring an LP to digital

If your like me you have a nice collection of vinyl LPs that you like to listen to but sometimes the portability of having mp3 files is also a good thing. The answer is to digitize your vinyl collection and put the songs on your computer. So here is an explanation of my method for doing so using Audio Evolution 4.0.23.

Things You Will Need

1. A turntable
   
2. A stand alone phono preamp or amplifier/receiver with phono inputs
   
3. A stereo RCA to 3.5mm mini jack adaptor
   
4. An RCA extension audio cable long enough to reach your computer
   
5. MorphOS and a copy of AudioEvolution 4
   

Getting Started

First thing is to make sure your turntable is connected to your phono stage/amplifier correctly. Also ensure it is setup correctly with a good stylus and some clean records to play.

If you are using a receiver or integrated amp then you need an RCA audio extension cable plugged into the TAPE REC OUT jacks on the back of the unit. (this may vary by model) If you have a stand alone phono preamp then plug your audio cord directly into the output jacks.

In either case the audio output cable should then be connected to the 3.5mm mini jack adaptor.

On the back of your computer you need to find the line-in jack. This is usually colored blue. Plug the 3.5mm mini plug into this port.

OK. Everything is now connected to start recording audio into your computer.

Launching the Software

Select an audio mode

Make sure you are recording from line in

Select a screenmode

Start Audio Evolution 4 software and select an approprate screenmode. When it asks what audio mode you want to use select the appropriate option for your machine. If you have an external soundblaster card for instance then "EMU10kx HiFi 16 bit stereo++" would be correct. A Pegasos using internal audio would need "Pegasos: HiFi 16 bit stereo++". I would suggest 44100 as the sampling rate as this matches CD audio quality and will translate well to the MP3 format.

Start a new project

Now select Start a new project and give your project a name in the filerequestor. Keep in mind that your project location is where all recorded audio samples will reside so make sure you have at least a couple GB of free space.

Set audio card input source

Under (menu item: Options->Soundcard in/out) make sure input is set to line in. Now is also a good time to save your preferences. (menu item: File->Save preferences)

Preparing to Record

Find the control window

Next step is to find the Control window. This is often hidden beneath the Time Line Display window when you first start the application so use the depth gadgets to reveal it.

Testing the input

Now press the red record icon to open the recording panel. Click the check gadget next to the Left and Right input levels. Now put an LP on your turntable and start playing the record. You should be able to see how much input you are getting into the Left and Right channels. If you see the colored meters moving then you are recieving audio from your turntable and are nearly ready to record.

Setting correct gain

If the L/R levels appear too low you may have to increase the gain setting. I found a gain setting around 15 to be good for most of my recordings. The correct value will vary a little depending on your equipment and the record you are playing. You want to keep the level meters in the upper green area with only the very loudest parts of the recording just peaking into the red area. This will give you a good balance of volume and preserve the dynamic range of the recording. Do not record with the signal constantly going into the red as you will be effectively clipping off and losing a lot of audio data that you want to preserve.

Recording the Audio

Time to record

If everything checks out up to this point then get your tonearm cued up at the beginning of the A side of the record and press the red 'rec' gadget. Now you will notice your hard drive LED flashing as well as the virtual HD LED in the recording window. This means that audio is being saved onto to your hard drive. You can now lower the tonearm down at the lead in groove and start sending audio data to the software. Once you reach the end of the LP side you can press the stop gadget to stop recording and save your sample. When the requestor asks if you want to keep the sample select 'okay' and give it a filename.

Editing the audio waveform

Getting ready to edit

At this point we will begin to break up the large audio stream into the individual music tracks that make up the album side. You need to close the recording panel to continue. The rest of the work will mostly be done in the Time Line Display.

Viewing and playing back the audio waveform

After recording you will see a visual representation of the audio you just recorded in the timeline display. First its a good idea to expand the track display until you can see the track we are working on better. Also adjust the zoom level so that you can see the silent gaps between the songs better. Generally a zoom level of 8 or so is ideal. The scroll bar at the bottom of the window is used to scroll left/right through the audio data currently displayed.

You can listen to any part of the waveform by first clicking the time ruler at the top of the track listing to set a starting position. Give it a listen by pressing the play key on the control window or pressing the space bar.

You can also click and drag the green time marker around for fine adjustment of your current playing position.

Trimming lead in and lead out

First thing we need to do is trim off the empty junk at the beginning and end of our LP side. So we need to find out where the first song starts visually and by listening. We then want to seperate this lead-in area from the actual start of the first song. We will use the split tool to achieve this

Put the editor into split mode by selecting the gadget first. Now as you hover the mouse pointer over the waveform you will see a dotted line that demonstrates where a split can be made. Line up the dotted line just before the start of audio and click once. Now change the edit mode back to grab/move before continuing. Now you may notice that we have two seperate pieces of audio data sitting next to each other at the split point. Lets remove the junk data at the beginning. Simply click the junk data to select it and then press the delete key or right click to bring up the Actions menu and select Remove. Presto it's gone and we are left with only the part we want to keep.

Scroll to the end of the LP side and using a similar process remove the junk data at the end of the LP. So to recap listen for when the audio data ends. Select split tool and click once where you want to split the data. Then switch back to grab/move mode and remove the left over part.

Seperating the audio tracks

At this point we are have the complete audio that we want to keep with the lead in and lead out trimmed off. Next we want to split the one large waveform into seperate song tracks. This is easily achieved by finding the silent parts between each song track visually and listening and then making a split just a little before the start of each song.

Saving the audio tracks

Now you can proceed to select each song by clicking on the sample data once and then right clicking and selecting the 'Save To Disk' option for each track. Give the tracks meaningful names like this.

Congratulations you have now recorded, trimmed and saved out all of the songs from one side of an LP. Now you can repeat this prodedure for Side B.

Converting to MP3 files

So next thing you are asking is how am I going to make these into MP3 files. I suggest the freeware program TheMpegEncGUI. You can specify a list of input files where you can select the AIFF audio files that you previously saved to disk and then you can batch encode the lot of them in one fell step. I suggest using joint stereo 256Kbps encoding for good quality MP3 playback.