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Are you importing it into the Waveform edit view or into Multitrack? Some tools will be greyed out depending on which view you are using. For instance the Razor tool is only available in the Multirack view.
Thanks! Now i can use the razor tool!
but i still don't know why Audition says that my file is mono.
I mean, the media info says that my file is "2 channels", so it can't be mono.
We would need to see the file itself, or a screenshot of the waveform and files panel to be able to tell you for certain. Where did this file come from?
Audition says it's mono because the file--at least the version you uploaded--IS mono.
As Durin asks, what's the source of the file and why are you sure it's stereo?
Media info program says that the file has 2 channels, so i thought it would mean that the file is stereo.
Is this program wrong? Half wrong?
If it is wrong, can you point me to a software that can do a better job in file info function?
Because Windows isn't any better in that function either.
Perhaps you could start by telling us the source of the file and exactly how you imported it into Audition? I've never in 40 years of audio work (and 17 years with Cool Edit/Audition) needed an info programme to tell me if something is one or two channels.
Also, where are you applying your info programme? Even with a mono signal, unless it's panned, Audition will output to two channels...but that's not stereo.
MediaInfo is a very good free media fle info prog.
Complete name : C:\\Megaman Zero Mythos__Departure.m4a
Format : MPEG-4
Format profile : Apple audio with iTunes info
Codec ID : M4A
File size : 2.03 MiB
Duration : 3mn 33s
Overall bit rate mode : Variable
Overall bit rate : 79.5 Kbps
Writing application : Lavf54.63.104
ID : 1
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 3mn 33s
Bit rate mode : Variable
Bit rate : 76.0 Kbps
Maximum bit rate : 78.5 Kbps
Channel(s) : 2 channels
Original Channel count : 1 channel
Channel positions : Front: C
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 1.94 MiB (96%)
Oh! I see that media info says it has 1 channel on "Original Channel count".
So it really is mono.
But why it says that there's 2 channels?
What does it mean then?
If I'm reading that print out properly, it says the original channel count was 1, i.e. mono, but that it's playing back in 2 channels now. This makes sense because, as I said, Audition (and most DAWs I know) play a mono file panned centrally so you get sound from both speakers/headphones/whatever.