audio mixing without extracting the zip file

Hello . Thanks for reading .
I have now serious problem.
These days , i am so much busy that i gave audio mixing project to my colleague
But it seems like she didn’t extract the zip file and drag the wav to audacity files . I just found that …

The extreme high and low tone was cut. Due to this problem, as you can check the attached wav file , the sound quality is seriously damaged

I am really really frustrated now as my big work has been spoiled like this .

may i ask ,

  1. is this the reason for damaging the sound quality ?
  2. is there any way to recover the sound quality ?

I do need your kind help please

Thank you so much


It’s not a zip-file issue, it’s wraparound-clipping issue.
The original waveform extends beyond +/- 1.0

when you export that the regions beyond +/- 1.0 will be distorted, (“after”).

Normalize the track to, say, -1db, then repair the clipped regions …
repair wraparound clipping.gif

oh Mr Trebor , Deeply thank you so much for your kind reply.

I think I have to replace from the original WAV file.

But may I ask, why this problem occured in detail ? I gave audio mixing to another colleague. When I send by audacity data file, the file is too much heavy so I export the track as WAV and send to my colleague. Then he import this WAV and do the mixing with other track. I think it is the reason of the problem.

Then , is there any way to solve this problem not damaging the sound quality?(I don’t want my WAV file be cut over or below 1 and -1 db)

Thank you so much in advance

I don’t understand your process or file conversions…

Then , is there any way to solve this problem not damaging the sound quality?

You can export to 32-bit float WAV. For all practical purposes floating-point has no upper (or lower) limit. Of course, uncompressed 32-bit files are twice the size as 16-bit files and the Zipped file will be larger too.

(I don’t want my WAV file be cut over or below 1 and -1 db)

FYI - That scale isn’t “dB”. 1.0 represents 100% which is 0dBFS or the “digital maximum”.

The problem is - Your DAC (digital-to-analog converter = playback) is hard-limited to 0dB and you’ll get clipping if you play back at full-digital volume. Your ADC (analog-to-digital converter = recording) is also limited to 0dB. It’s “bad practice” to make a “permanent” file that goes over 0dB.

I recommend you configure Audacity to [u]Show Clipping[/u] (which actually shows potential clipping).

When mixing it’s hard to predict the mixed level so one solution is to export as floating-point WAV, then re-open and Normalize before exporting to your desired format. Another option is to lower the level before mixing (and you can boost the mix later if necessary).