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Wave Corrector

Convert Vinyl Records and Tapes to CD & Digital Audio

Frequently Asked Questions - All FAQs

FAQs - All FAQs

When you start Wave Corrector and scan in a wave file, the opening screen will look something like the left-hand image below:

opening

Before Adjustment

       

after

After Adjustment

This is the way Wave Corrector displays a track boundary, in this case the Start of Track 1 boundary. The white vertical line at the centre of the screen is the boundary marker.

If necessary, you can re-position where the track starts and/or add a fade-in period. To re-position, pick up the white marker with the mouse and drag it to the left or right. The yellow bar at the top is used to set a fade-in period. By default the fade-in is set to 0, so the left hand edge of the bar is vertical. But you can drag this with the mouse to create a triangular portion which represents the fade-in period. This is shown in the right-hand image above.

No, we do not have the resources to port Wave Corrector to other operating systems. However, if you run Linux on a  PC, then it is possible to run Wave Corrector under WINE. WINE is an open source implementation of the Windows API that runs on Liinux. You can find more information at WINE HQ. Please let us know if you encounter any problems running Wave Corrector under WINE. There are also implementation of WINE for MAC OSX. ALthough not free, the most user firendly implementation of WINE for both Linux and Mac are from Codeweavers.

See some screenshots of Wave Corrector running under WINE here.

Skips in recordings are symptomatic of your computer not being able to keep up with the flow of data from your soundcard. This causes buffers to overflow and loss of data. Wave Corrector uses generous buffer sizes so this problem is relatively rare. However, if you are affected, you should investigate the following possibilities:

  1. Disk fragmenting. It is possible that your hard disk is fragmented. This greatly slows down disk writing and could be a possible cause. There is a defrag utility built into Windows, so you could try running that.
  2. Other programs running in the background. It?s possible that you have other programs running which are taking resources away from the recording program. For example, if you have MS Office installed, by default it runs a utility called FindFast every 2 hours. This indexes all the document files on your hard disk and it is likely to disrupt disk access by other programs while it is running.
  3. Physical memory. Your recording program uses physical memory to buffer the audio data. If your computer has insufficient physical memory, then it will try to use virtual memory which will not be fast enough. 128MB of physical memory is recommended for most recording programs.

We do not supply a printed manual. However, on our website, you can download the manual in Adobe Acrobat format. You can then print it out yourself if you so require.

There is also a tutorial on our website which you can also download and print out. The tutorial gives a general introduction to recording vinyl audio on your computer with additional sections specific to Wave Corrector.

To download the manual (or tutorial) right click on its link and select the option ?Save Target As...? This will save the manual (or tutorial) to your hard disk. Once saved, you can print it out or view it as required.

The manual can be found at support and the tutorial at tutorials.

While processing, Wave Corrector keeps a temporary copy of the file being processed thus, in effect, doubling the disk space requirements. So for example, processing a 60 minute wave file will require about 1.2GB of hard disk space.

The temporary copy is used to provide the overlay display of corrected and uncorrected wave.

This is dictated by the fact that file positions are calculated using signed 32bit arithmetic. For this reason you should ensure that wave files to be processed in Wave Corrector are no longer than 3hrs 30mins.

To apply fades between tracks, you must ensure that "Gapless Track Boundaries" mode is not selected. You can turn gapless mode on or off by clicking on the 'Gapless' command on the Tracks menu.. (Note, the reason that you cannot apply fades if "Gapless Track Boundaries" is selected is that this mode is designed for "Disk-at-Once" recording where the CD plays without breaks between tracks; so it wouldn?t be sensible to apply a fade in these circumstances.)

Then, the simplest way to apply a fade is to use the "Next Marker"/"Previous Marker" toolbar buttons to select the track boundary where you want to apply the fade. Then, drag the yellow "fade bar" at the top of the window to set the length of fade required. As you drag it, the bar becomes triangular to indicate the fade duration.

Alternatively, you can use the "Properties" command on the Tracks Menu, to enter fade-in or fade-out times directly.

To hear the effect of a particular fade, you have to select the track boundary as described above and then use the ?Audition Track Boundary toolbar button.

The fade(s) will be applied to the output file(s) as they are saved.

Unfortunately, the algorithms used in Wave Corrector are proprietary, so we cannot reveal exactly how they work. However, the program implements two distinct functions: click detection and waveform regeneration.

For click detection, the program calculates the instantaneous rate of change for each sample point and performs a statistical analysis of these rate of change values. Outlier values are marked as potential clicks, and then further analysis is performed to differentiate actual clicks from musical transients.

Waveform regeneration is performed using an iterative technique.  The program performs a frequency analysis of the waveform in the vicinity of the click being corrected. The most significant frequency components are used to generate an initial replacement waveform, and then the process is iterated using a technique similar to successive approximations.

A newly inserted manual correction is given minimum width and hence has no effect until it is accurately positioned over the click being corrected and the width adjusted to an appropriate value.

If, having done this, a click is still audible then there is probably a second click very nearby which you will need to correct as well.

What this demonstrates is that Wave Corrector's click detector can mis-fire due to musical content. Although this might seem a problem, in practice it usually has a negligible effect on the quality of the end result. This is because the replacement waveform that Wave Corrector generates (the 'correction') is calculated to accurately match the surrounding wave. Hence you are unlikely to hear any aberrations as a result of these 'false positives'. The only exceptions are with certain instruments (eg low frequency brass) which can cause clusters of corrections very close together. These can alter the quality of the sound making it more 'rasping'. The signature command on the view menu enables you to determine if this is happening and you can remove these spurious corrections using the block commands.

Click discrimination is a difficult process because the program has to find clicks in the presence of such a wide variety of possible musical content. Wave Corrector, in common with most similar software, uses a statistical method which looks for sudden changes in the statistics describing the wave.

All click eliminator programs suffer from this problem to some extent. In Wave Corrector, we've concentrated on making the 'corrections' as accurate as possible and also on providing the tools to enable you to audition and correct any mistakes the program makes.

There is a section in the Help File on 'false negatives' and 'false positives' which goes into this in more detail.