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Audacity User Guide - Audio Visual Group

1. Then use the Effect Noise Removal command OldSkeltonVO1 Onginal File Edit View Project Generate Effect Analyze Help I X g i Ef R pL L d Pox Amplify wy 21 0 Sm 21 0 a 1 07 5 1 08 Bass Boost 1 09 0 1 095 7 Change Pitch Mono 44100Hz Change Speed Change Tempo Click Removal Compressor Echo Equalization Fade In Fade Out FFT Filter Invert Noise Removal Normalize Nyquist Prompt Version 0 5 Page 9 of 18 AUDACITY A USER GUIDE FOR A V WORKERS Noise Removal by Dominic Mazzoni Select a few seconds of just noise so Audacity knows what to filter out then click Get Noise Profile Noise Removal by Dominic Mazzoni Step 1 Select a few seconds of just noise so Audacity knows what to filter out then click Get Noise Profile Noise Removal by Dominic Mazzoni Step 1 Select a few seconds of just noise so knows what to filter out then click Get Noise Profile Get Noise Profile Get Noise Profile m Step 2 Step 2 Select all of the audio you want filtered Select all of the audio you want filtered choose how much noise you want filtered out choose how much noise you want filtered out and then click Remove Noise and then click Remove Noise Select all of the audio you want filtered choose how much noise you want filtered out and then click Remove Noise j More Less _ e Figure 2 Figure 1 Figure 3 In the
2. 7 yi ue See iy 5 y jani Ai Nee Mi g wF E cao os VEIS Ne fee F X ii 4 TEER TET Cae EP ery 9 Ue ee T did erry oh aaa E E Own nT Oe VO NAA We a i a i a h 4 yd if oh saith id F E A Dah we cin alll Ve i b Ea CA j uaii ai wey TEY ied i VW LE TERT y bt seis ku k f yi ha tiles Bee hal EN NY L ii ws ll P bis id te Y ie sn 4 Suse a A l hid oh liti W thy TE i hy ltd iyl by bu dh at hy he Lisl hh bi Bui y Li ee Bii mv i ya at a wa ji r Wi m id Bs my me ay aiii Version 0 5 Page 15 of 18 AUDACITY A USER GUIDE FOR A V WORKERS In this situation all you need to do is hold back the music volume all the way through the final mix This is most easily achieved by lowering the gain on the music track to 18dB or even 21dB depending on the overall volume of the music track File Edit View Project Generate Effect Analyze Help Pio j r r j j f o dwm N Sm 21 0 of ay OB Ha akel Fe PRR a a l 5 30 4 1 00 1 15 Stereo 44100Hz 32 bit float Mute Solo Gain 18 dB f v t Mono 44100Hz 32 bit float Mute Solo You can preview this mix simply by changing the gain and then playing back Note that the waveform display of the music track does not change appearance to show the reduced gain level If you are happy with this mix then export the entire project as an MP3 file to use in your PTE project 8 2 Complex mixing If your voice over applies only to some images with short ru
3. having them play together Beneath the buttons is the Gain control This allows you to have the track play back at a lower volume than that at which it was recorded or at a greater volume to that at which it was recorded Below the Gain control is the Pan control This controls how the signal is distributed between the left and right channels 3 Importing and ordering the soundtrack components 3 1 Importing the soundtrack components It is assumed that all your soundtrack material music files voice over actuality recordings etc already exist as WAV files To bring these into an Audacity project use the Project Import Audio command SPCS7 File Edit View Generate Effect Analyze Help This will give you a standard file navigation window t Import Audio Ctrl I that you can used to locate and identify the sound Import Labels i Reg ee file that you want Audacity to import into this Import Raw Data project As each one is imported it will appear as a ee e Tr separate track in the Audacity window Mute Solo Quick Mix New Audio Track A As you can see this command also allows you to add eE et a new empty stereo track or a new empty mono New Time Track track called audio track in the list of options Remove Tracks Align Tracks Align and move cursor b Add Label At Selection Ctrl B Mono 44100Hz 32 bit float Version 0 5 Page 6 of 18 AUDACITY A USER GUIDE FOR A V W
4. it from this project Move Track Down Waveform Waveform dB Spectrum Pitch EAC R ght hanne Split Stereo Track Set Sample Format b L l w 7 Set Rate b se ee Version 0 5 Page 7 of 18 AUDACITY A USER GUIDE FOR A V WORKERS 5 Display of tracks 5 1 Display of tracks There are four possible display types shown in the track options drop down Waveform Waveform dB Spectrum and Pitch EAC A sample of each is shown below Waveform Waveform dB Spectrum Pitch EAC For most usage the Waveform will be the best choice However when doing a final mix down using the Envelope Tool see later it can be advantageous to change to the Waveform dB display have not yet found a need to use either the Spectrum or Pitch EAC display forms Version 0 5 Page 8 of 18 AUDACITY A USER GUIDE FOR A V WORKERS 6 Noise Reduction 6 1 Setting expectations Before we dive into the how to do it bit let s get one thing clear you cannot make a poor recording better by using Effect Noise Removal In my opinion Audacity has picked a poor term for this You cannot remove noise What you can do sometimes is reduce the noise All that Effect Noise Removal will do is make a poor recording even worse What you can do is use Effect Noise Removal to make an already good recording even better sometimes In this respect sound file manipulation is very different to image file manipulation You can
5. the end of the track and then drag back to the left SPCS4 File Edit View Project Generate Effect Analyze Help eal i amp x al R 4 i b fi 6 anes pees bees bone aan A AN Pax dwy 210 Je tio ga AHH To P PRR 30 35 40 45 50 55 1 00 1 05 1 10 1 15 o Nl o N 1 30 1 35 1 40 Now all we need to do is use the Effect Fade Out command SPCS4 File Edit View Project Generate Effect Analyze Help s E e A apl J Amplify 4 210 Je 2 o 48 Btw aE Ne Bass Boost 55 1 00 1 05 1 10 1 15 Change Pitch Change Speed Change Tempo Click Removal Version 0 5 Page 13 of 18 AUDACITY A USER GUIDE FOR A V WORKERS And there is our fade out applied amp SPCS4 File Edit View Project Generate Effect Analyze Help T rl 3 ro jie LY Oo u D at 9 Z 5 Pje xk TE E ii kac Gee slol P PRE 1 00 1 05 t 3 Obviously for a fade in you would be working at the other end of the track but the basic technique is the same 7 4 Using Effect Normalize When making an original open microphone recording we must ensure that we have controlled the input signal level to avoid clipping Clipping occurs when the signal strength exceeds the capability of the recording equipment to capture it without distortion It can be best understood by loading a bad recording into Audacity and changing the view to show the Waveform db display File Edit View Project Generate Eff
6. use Photoshop to remove unwanted objects noise from your images In a sound recording the frequencies involved in the noise the frequencies that you want to remove are the same frequencies that will be present in your voice or the music You cannot remove the noise frequencies without having an effect usually both detrimental and audible on the rest of the track Just as with your photography where hope you try and get the best possible result at the time of taking so with your sound recordings You should strive to obtain the best possible original recording Remember the best form of noise reduction is not to record it in the first place 6 2 Concepts of Noise Reduction It helps if you understand the concepts behind noise removal filters You give the filter a piece of recording that contains just the noise so that it can analyse it and understand what noise looks like digitally speaking Then you give it the whole or part of the recording and ask it to remove the noise In broad terms all it does is try and take out the given frequencies where they are the only thing present and then maybe adjust the volume elsewhere by reference to the amount of volume present in the noise to try and mask its presence So with that out of the way let s look at how you can use Audacity s Noise Removal tool 6 3 Using Effect Noise Removal Begin by selecting a piece of your recording that has just the noise present See example below
7. 1 Stereo A stereo track is one having separate left and right channels the left channel being fed to the left loudspeaker and the right channel being fed to the right loudspeaker In this context left and right are as perceived by the listener sat in front of the loudspeakers 2 2 2 Mono A mono track is one having a single channel which on playback will be fed equally to the left and right loudspeakers Version 0 5 Page 5 of 18 AUDACITY A USER GUIDE FOR A V WORKERS 2 3 The Track Panel The track panel at the left of each track contains the following features X SPCS4Editt Y Stereo 44100Hz 32 bit float Mute Solo At the top is the track title and to its left the x button which can be used to close this track i e remove it from the window Immediately below the track title is the indication as to whether this is a Stereo or Mono track together with the Sample Rate in this case 44100Hz and the Sample Format in this case 32 bit float For detailed explanations of Sample Format and Sample Rate see the Audacity Reference Manual mentioned in Section 1 3 Beneath this information are the Mute and Solo buttons The Mute button is used to prevent this track playing back The Solo button is used to play back only this track Note the you can Mute several tracks at the same time and you can Solo several tracks at the same time In this latter case you are effectively picking which tracks you want to hear and then
8. AUDACITY A USER GUIDE FOR A V WORKERS AUDACITY SOUND EDITOR SOFTWARE A USER GUIDE FOR AUDIO VISUAL WORKERS Prepared by Peter Appleton Copyright 2008 All illustrations in this guide were created using Audacity v1 2 6 Version 0 5 Page 1 of 18 AUDACITY A USER GUIDE FOR A V WORKERS CONTENTS Section 1 Introduction 1 1 Purpose of this manual 1 2 Audacity s Help File 1 3 Audacity s Reference Manual amp Tutorials 1 4 Audacity Wiki 1 5 Audacity Forum 2 Concepts amp Terminology 2 1 Audacity window its components parts 2 2 Stereo amp Mono recordings 2 2 1 Stereo 2 2 2 Mono 2 3 The Track Panel 3 Importing and ordering the soundtrack components 3 1 Importing the soundtrack components 3 2 Ordering the soundtrack components 4 Creating new tracks 4 1 Creating a new mono track 4 2 Creating a new stereo track 4 3 Creating tracks by splitting stereo tracks 5 Display of tracks 5 1 Display of tracks 6 Noise Reduction 6 1 Setting expectations 6 2 Concepts of sound reduction 6 3 Using Effect Noise Removal 7 Manipulating tracks Tal Adding silence to a recording 7 2 Changing the length of a recording 7 3 Applying fades 7 4 Using Effect Normalize 8 Mixing tracks 8 1 Simple mixing 8 2 Complex mixing Version 0 5 Page WWW WW W OoUuUM Mm amp A NOS OD CO N NNN 0 0 WO WO WO WO 10 11 13 14 15 15 16 Page 2 of 18 AUDACITY A USER GUIDE FOR A V WORKER
9. ORKERS 3 2 Ordering the soundtrack components You can change the order in which the tracks are displayed from the track options dropdown oe To do this you first need to click on the track title to get the drop down and then click on Move Up or Move Down An alternative technique is simply to left click anywhere in the Track Panel and then drag the track up or down to the required position Waveform dB Spectrum Pitch EAC Split Stereo Track Set Sample Format b 4 Creating new tracks 4 1 Creating a new mono track As we saw in section 3 1 we can create a new empty mono track by using the Project New Audio Track command 4 2 Creating a new stereo track As we saw in section 3 1 we can create a new empty stereo track by using the Project New Stereo Track command 4 3 Creating tracks by splitting stereo tracks If your voice over recording is a stereo track it might be worthwhile splitting it and converting one channel to mono and deleting the other channel This will ensure that your voice is placed centrally on the stereo sound stage in the final mix down To do this proceed as follows e Select your voice over track by clicking on the Track Panel e Call up the track options by clicking on the Track Title e Click on Split Stereo Track e Select one of the tracks thus produced e From the track options click on Mono e Select the other track of the pair e Click on the x button to remove
10. S 1 Introduction 1 1 Purpose of this manual This manual is not intended to be a comprehensive guide to using Audacity as a sound editor program Rather it concentrates on those aspects of Audacity that are likely to be of most value to someone preparing a soundtrack for an AV sequence It therefore concentrates on those aspects that apply to the background music and the voice over and the mixing of them both into the final soundtrack 1 2 Audacity s Help File It is not the intention of this document to replace the Audacity Help File Please do take time out to read the contents of the Help File before reading this User Guide 1 3 Audacity s Reference Manual and Tutorials It is also not the intention of this document to replace the excellent Reference manual and Tutorials that can be found on the web at http audacity sourceforge net manual 1 2 index html This web source provides excellent explanations of Sample Rate as expressed in Hertz Hz Sample Format as expressed in Bits Sound level as expressed in decibels dBs File formats including AUP WAV MP3 and others The component parts of the Audacity Window Basic editing techniques including Selection Cut Copy Paste Again please do take time out to explore this excellent resource before reading this User Guide 1 4 Audacity Wiki Also available via the Audacity web site http audacity sourceforge net is a Wiki containing many articles of interest and value to anyon
11. e 10 of 18 AUDACITY A USER GUIDE FOR A V WORKERS SPCS7 r Next we must tell Audacity where we want the silence inserting want it at the beginning of the track So here have just positioned the cursor at time zero by left clicking just inside the left edge of the waveform area File Edit View Project Effect Analyze Help Now we Can use the Generate command I fd Silence ple x re Tone m dl Sg aa eee 15 And select the Silence option T 1 0 T Click Track Stereo 44100Hz 32 bit float Mute Solo Q A 0 5 Q 1 0 1 07 Pluck Fry ay A Ae gi 0 0 0 5 L ea Inthe pop up we can specify the number of seconds of silence Length eeconds EE that we want 30 is the default In our worked example would key 5 in this pop up Press the Generate Silence button to add Cne the silence r And here s the result Our music track now begins with 5 pore amp amp amp seconds of silence 7 2 Changing the length of a recording When building an AV sequence have you ever arrived at the point where you ve found an ideal piece of music but it is either a just a bit too short or just a bit too long Well all is not lost Audacity enables you to lengthen or shorten a piece You do it by using the Effect Cchange Tempo command Let s take a look at this technique Here s a piece of music whose length we d like to change Versi
12. e venturing into the complex world of sound recording and sound engineering 1 5 Audacity Forum The Audacity community also has its own Forum accessible via the Audacity website This too is worth some time spent on exploration Version 0 5 Page 3 of 18 AUDACITY A USER GUIDE FOR A V WORKERS 2 Concepts and Terminology 2 1 Audacity window its component parts To ensure that we have a common vocabulary let s take a brief look at the components of the Audacity window This subject is covered in greater depth in the Audacity Reference Manual see reference in Section 1 3 Here is a typical Audacity window R FPE P bl 3 Py we emama ole 2 222 Po 8 eee Ole Alea FES EE 7 Bt Bd Bad Bad Bas AE 0 15 need anes bead end be F 4 ki 21 0 uia bi AG iig Project rate 44100 Cursor 0 00 000000 min sec Snap To Off At the top we have the Windows title bar the Command bar then various of Audacity s features and below them all the timeline In this example the timeline has tick marks every five seconds Let s explore the Audacity features Me These are the icons for Audacity s tools Reading left to right top to bottom TEE they are the Selection tool the Envelope tool the Draw tool the Zoom tool the Time Shift tool and the Multi Tool Mode Most of what we want to achieve will be done using just the Selection Envelope and Time Shift tool
13. ect Analyze Help Ea L L 4 7 E Lik g n j O ZS 0 Piel xk Ro Pig a bith hall a P PIZIA A 1 15 4330 145 200 215 1 30 1 45 2 00 2 15 30 245 E 3 45 4 00 4 15 4 30 4 45 5 00 5 15 5 30 TD MON me Haj N ea CT ITT WMI MT ee AAMA A PW Above can be seen a badly clipped recording Many of the spikes extend all the way to the edge of the track window A really bad recording will have flat spots where the sound level is constantly hard up against the edge of the track window This recording has many other faults but it s the clipping we re interested in This recording is so badly clipped that nothing can be salvaged from it A re take is required with recording levels kept under better control Commercial recordings should have been properly engineered and should not have any clipping Indeed they should appear to have their peak levels around the 3cB level on the Waveform dB display If your voice over recording has just occasional and very short duration clipping you can sometimes achieve a cleaner result by normalizing your recording CanadianRockiesVO1 File Edit View Project Generate Effect Analyze Help n 9 o 7 of nigga ag yp P jk 1 wy 21 0 Padi i 21 0 X Ra amp fit HN A PIE 30 45 l I Mono 44100Hz 32 bit float Mute Solo i Version 0 5 Page 14 of 18 AUDACITY A USER GUIDE FOR A V WORKERS The previous illustration shows a voice ov
14. er with just very occasional slight clipping This can be salvaged by normalization To do this you simply select the track to be normalized and then use the Effect Normalize command nadianRo Vol Te tot Vew Poet Genome Efect Amine Repeat Last Effect CtriR u re 4 T oe Te Pad By SRN Te E A a P Amplify 4 210 Dry 21 0 Ba Change Pitch Change Speed Change Tempo Click Removal Compressor Normalize by Dominic Mazzoni M Remove any DC offset center on 0 vertically M Nomalize maximum amplitude to 3 dB always take the default values in the pop up window And here s the result of normalization SEALS E MED hd eer File Edit View Project Generate Effect Analyze Help 8 Mixing tracks 8 1 Simple mixing Let s assume that you have two tracks loaded into Audacity a music track and a voice over track And let s also assume that you ve done all the processing you want on them and are ready to do the final mix down Finally let s assume that all or nearly all of your images have voice over File Edit View Project Generate Effect Analyze Help OOOO SIS i 4 EAS N E Cans T fee Si Da 4 Poy Sy we Vor ee ae xy we ba Aad de Ubi ws Sg PA yey ee ie nu Perey Oey Se al d A verve wey tae her yey pe die ae ye PEAY k reo kaiih ani s N renee AAT uigh aildas a adi bh me Bos D iii UT ee ee i Pre i D iid wad Aid nll We Yee peT aid TIT So adh Heck Si
15. iment And remember your audience sees and hears only the finished product You alone know how it all started out Version 0 5 Page 12 of 18 AUDACITY A USER GUIDE FOR A V WORKERS 7 3 Applying fades There are three ways of applying fade to a track Effect Fade In Effect Fade Out and the Envelope Tool This section deals with the first two the Envelope Tool has a section all to itself later on For music that has been ripped from audio CD the ideal situation is to use the natural fades that exist in the original recording If however you feel that your best option is to cut part of the music track and apply fades to it then here is what you do Here s a piece of music that has had its final part cut away SPCS4 o File Edit View Project Generate Effect Analyze Help TEC Sig i uf 4 7 P b Pax d 2 0 Po 210 Fa BHH a P PRR 1 30 1 35 1 40 We want to apply a fade out to the end of the piece Firstly we must decide how long a fade to have A fade in can typically be quite short maybe only 1or 2 seconds A fade out typically needs to be longer maybe 5 to 10 seconds or even more You can use the Gain slider on the track panel during playback to practice the fade and assess the overall effect before committing to apply the fade But do remember to return the Gain to its original position We must now select the part of the music to which we want to apply the fade The simplest way is to click just off
16. la di nl To get to the next sample have done several things e have changed the display of the stereo track to show the Waveform dB display e have positioned the mouse pointer on the blue line at the top of the stereo track as close to time zero as could and have then dragged the blue line down to just above 20dB on the vertical scale File Edit View Project Generate Effect Analyze Help x IR ilk E 4 a 4 I a P on lek 2 Y Y Y Y Sort Paan eee alc Pee Version 0 5 Page 17 of 18 AUDACITY A USER GUIDE FOR A V WORKERS That has set the base level for the music so that it doesn t drown out the voice over It s the equivalent of lowering the gain to 18dB as we did in the simple mix in the previous section But we would like to lift the volume up a little during those parts of the sequence where we have no voice over So we need to place some more envelope points by clicking on the top blue line of the stereo track We need one just as the piece of voice over ends and another one about one second later Then we need another pair at about one second before the next voice over starts We can then drag the appropriate points up a little so as to lift the volume of the music when there is no voice over The display takes on this kind of appearance after we have done that SPCS7 BRA File Edit View Project Generate Effect Analyze Help i a I Be 4 Ee pi Va ue Ji fo PENEN B R ee Ae
17. ns of images having no voice over you have a more complex mix to do You will still want the music lowering to 18dB or even 21dB where it conflicts with your voice over But on the parts where you have just slides and music you will probably like to have the music a little louder This degree of control is possible using the Envelope Tool Here s how to set about using this tool Below we have a mixing set up involving a stereo music track and a mono voice over track The music track has been selected File Edit View Project Generate Effect Analyze Help W Re af Jo od A De J Jelek as 9J n m oma o Pamano AB jo 2 PLL Mono 44100Hz Version 0 5 Page 16 of 18 AUDACITY A USER GUIDE FOR A V WORKERS The next step is to choose the Envelope tool giving this display PCS7 File Edit View Project Generate Effect Analyze Help Ibe mM n m te 210 Dw 2 0 5 N EEA A O filha aa MAUD hd i an Ba ci il jh ak ada McA MM ohh lla a hi Dl ha When using the Envelope tool we always want to see the timeline in some detail so that we can position our envelope points with reasonable accuracy So here have zoomed in until the timeline is showing tick marks every half second 3PCS7 File Edit View Project Generate Effect Analyze Help IB ae ey Ay Ee oB lo e Pele i E E A E N A E ET A ll ll ONE iu a E i iy E is i i leila halla dh al ni i TT
18. on 0 5 Page 11 of 18 AUDACITY A USER GUIDE FOR A V WORKERS Edit View Project Generate Effect Analyze Help E f EL 4 b Ai of plex SPS Y Y Y Y sees AGT ema lo Aeee 0 15 30 45 1 00 First we need to select the track whose duration we wish to change Then we use the Effect Change Tempo command File Edit View Project Generate Effect Analyze Help Repeat Last Effect Cirle Li i f 4 I n 5 Pp i 5 Amplify 9210 Pa 2 o OB oo 2 2 2 2 Bass Boost Change Pitch Change Speed Change Tempo Click Removal Compressor Echo Equalization Fade In Fade Out FFT Filter Invert Noise Removal Normalize Nyquist Prompt In the pop up window we note the duration of the piece arg Saedah i Paian 92 13 seconds and over key this value with whatever we ry want it to be Beats per Minute BPM fom sto Length seconds from 92 13 to 92 13 In this example have set it up to give a final length of 90 seconds by Vaughan Johnson amp Dominic Mazzoni using Sound Touch by Olli Parviainen find that changes up to about plus minus five percent variation are almost undetectable Changes between five kekeme lal percent and ten percent are usually detectable but Length seconds from B213 to fl sometimes not intrusively SO _Preview Cca f ok As with all things in AV be prepared to exper
19. pek SJ 8 Y Y 2 Seri ages eee ao leee Mono 44100Hz 32 bit float Mute Solo Artistically you may find that you don t want to raise the music volume all the way back to full volume Experiment and find out what works best for you Once you are happy with this mix then export the entire project as an MP3 file to use in your PTE project Version 0 5 Page 18 of 18
20. pop up window Figure 1 click on the Get Noise Profile button Now select that part of the recording on which you want to try and reduce the noise and use the Effect Noise Removal command again Figure 2 Note that the Preview and Remove Noise buttons are no longer greyed out At this point you need to experiment with different amounts of noise reduction You do this by using the slider and the Preview button Once youv ve found a level that gives the best amount of reduction with the least amount of introduced distortion Figure 3 is the setting find generally works for me you can click on the Remove Noise button stress once more there is no substitute for getting the quality right in the original recording Noise Removal is not a magic wand that will turn a poor recording into a good one It won t even turn it into a passable one 7 Manipulating tracks 7 1 Adding silence to a recording There will be occasions when you would like some silence at a particular point in your soundtrack like to start and end all my sequences with a black slide onscreen for about 4 5 seconds So often want to add a few seconds of silence to the start and end of my soundtrack Let s look at this technique SPCS7 File Edit View Project Generate Effect Analyze Help fiz Pook Here s my music track loaded into Audacity Note that the Selection tool is the active tool a amp u i 2 gt a5 Version 0 5 Pag
21. s These Playback and Record controls are intuitive to use IBD Bik bid had hid ee The Level meters show the signal levels during playback the left 4 pe 21 0 w 21 0 meter shows green bars and recording the right meter shows red bars Version 0 5 Page 4 of 18 AUDACITY A USER GUIDE FOR A V WORKERS MR Pe seven fa pina ace The volume controls allow you to i 3 fi 0 set a volume level on the playback left slider and record right slider EA P The Edit tools give you quick access to commonly used functions when editing your tracks From left to right they are Cut Removes the selected passage and places it on the clipboard Copy Copies the selected passage to the clipboard Paste Pastes the clipboard contents at the current cursor location Silence outside Replaces everything except the selected passage with silence Silence selection Replaces the selected passage with silence Undo Undoes the last action Redo Re does the last undo Zoom In Increases the granularity of the timeline Zoom Out Let s you see the bigger picture as it were Fit selection in window Adjusts zoom to do what it says Fit project in window Adjusts zoom to do what it says 2 2 Stereo and Mono recordings The sample window we used in Section 2 1 showed two tracks one stereo the other mono x sPcs4Edit v 1 Stereo 44100Hz 32 bit float Mute Solo x srcsvoi_ v 1 Mono 44100Hz 32 bit float Mute Solo 2 2

Audacity User Guide - Audio Visual Group

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