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Lossy encoding can be viewed as a low-bit-depth quantization of a signal. The precision of this quantization depends on the selected bitrate, while quantization noise (a compression error: the difference between the original and the decoded signal) is spectrally shaped to be minimally audible — this is achieved by a psychoacoustic model.

The amplitude of quantization noise depends on the chosen bitrate and signal complexity. Slowly-changing tonal signals are easy to approximate, while random noises are hard (see the examples below). The amplitude of compression noise is often proportional to the signal level, much like with a 32-bit floating-point sample format. The noise of a 32-bit float format is always 150 dB lower than the signal level, while the noise of mp3 or AAC compression is usually only 15–30 dB below the signal level.

When quantization noise is added to the waveform, it can change the peaks levels. If the waveform has been brickwall-limited to a certain level, chances are that 50% of waveform peaks will rise in level.

Working with Files

Understanding the supported formats

RX 5 Audio Editor supports importing the following audio formats:

• WAV
• BWF
• AIFF
• MP3
• WMA
• AAX
• SD2
• OGG
• FLAC
• CAF

Note: mono audio files with (.L and .R) or (.1 and .2) extensions can also be opened as either mono files or split stereo. See Preferences > Misc to control this behavior.

RX 5 Audio Editor can import the audio directly from a number of video formats, saving you the step of extracting that audio in a separate application. Once you've worked with the audio in RX, you can export that audio and reassemble the video in your video editing program of choice. The following video formats are supported:

• AVI
• MPEG
• WMV
• MPV
• M4V

Note: RX 5 Audio Editor requires having QuickTime to open QuickTime formats (like .MOV).

RX 5 Audio Editor supports exporting the following audio formats:

• WAV
• BWF
• AIFF
• OGG
• FLAC

RX 5 Audio Editor uses your operating system’s available resources for opening certain file formats. Windows native formats (like WMA and WMV) may not open in OS X, and QuickTime formats (like AAC, MOV, and M4V) may require installing QuickTime on Windows and running RX 5 Audio Editor in 32 bit mode.

For the most up-to-date information about supported audio and video formats, check out this knowledgebase article.

Creating a new file

To create a new file in RX, open the File menu and select New..

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You will be prompted for the name, sample rate and channel count of the file you would like to create.

If you have existing audio data in your clipboard (for example, if you have copied a selection from an existing file in RX), you can open the File menu and choose New from Clipboard. A new file will be created with the correct sample rate and channel count.

Importing a file

There are four ways to import a file in RX 5 Audio Editor:

• From the File menu, select Open.. and select the files you want to open.
• Drag and drop a file from your operating system into the RX UI.
• Drag a file from Finder/Explorer to the RX icon in the Dock/Desktop.
• Double-click in the empty space of RX display.

There are two ways to create a new file in RX 5 Audio Editor:

• To create a new empty file in RX, open the File menu and select New.. After you select this, you will be prompted for the sample rate and channel count of the file you would like to create.
• If you have existing audio data in your clipboard, you can open the File menu and choose New from Clipboard. A new file will be created with the correct sample rate and channel count.

RX supports having up to 16 files open at once. To navigate between files currently open, either click on the file’s tab at the top of the RX 5 Audio Editor interface, or use the Ctrl-Tab and Ctrl-Shift-Tab keyboard shortcuts.

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If you right click on a file tab, you can see some more options for managing tabs and finding files on your hard drive.

If you have multiple files open, you can access extra tabs through the arrow button that appears next to the file tabs.

Saving a file

There are several ways to save a file in RX 5 Audio Editor.

RX Documents are the default format for saving your work. RX Documents have many benefits such as retaining Undo History and other valuable information about the work you’ve done to your audio files, so you can always review your edits and even go all the way back to the original state of your audio file.

The default keyboard shortcuts for the various save behaviors on Mac OS are:

• Cmd+S: save your RX Document.
• Shift+Cmd+S: save your RX Document under a new file name.
• Option+Cmd+S: Overwrite Original File. When directly editing a WAV or AIFF, this will overwrite the file on the disk.
• Cmd+E: export your audio to a WAV, AIFF, FLAC or OGG Vorbis file.

The default keyboard shortcuts for the various save behaviors on Windows are:

• Ctrl+S: save your RX Document.
• Shift+Ctrl+S: save your RX Document under a new file name.
• Alt+Ctrl+S: Overwrite Original File. When directly editing a WAV or AIFF, this will overwrite the file on the disk.
• Ctrl+E: export your audio to a WAV, AIFF, FLAC or OGG Vorbis file.

Note: the Overwrite Original File function works just as Save used to in previous versions (RX 1 to 3), and you can even customize your keyboard shortcuts to remap Cmd+S or Ctrl+S to use this, in the same way you can remap any keyboard shortcut in RX 5 Audio Editor.

Autosave

RX is always saving your editing session, enabling you to pick up where you left off the next time the application is launched, even in the event of an application crash or power outage. To keep you from losing any work pertaining to any audio file you currently have open, RX will store every audio edit, effect or algorithm that is applied, your full edit history list, and your last selection. By default, when the RX application is launched, it will open the last editing session and audio file that was in progress when RX was last quit.

Note: Saved session state recovery is ON by default. The option to turn it off is located under the Preferences > Misc tab as 'Resume last editing session when app starts.'

In the event that RX crashes in the middle of a restoration session, when RX is next launched, you will be given the option to rebuild your session just before the crash.

Backing up your work with RX Documents

Save a file using the RX Document file format (.rxdoc) to archive your edits.

RX’s session state can be stored in a portable document that includes your original file, all the edits you’ve made to it, and your most recent selection and view state. This document is useful for archiving your work.

RX Documents can only be opened with RX. If you need to save your file so it can be opened somewhere else (like a DAW or media player), you need to export it in another format (like WAV or AIFF).

To save an RX Document, select File > Save RX Document.. and select where you would like to store the file.

Keep in mind that the size of the RX Document file can be very large, especially if your list of edits include multiple processes on the whole file.

Exporting a file

When exporting, you will be able to define the output file name, directory, and bit depth. There are four ways you can export a file in RX 5 Audio Editor:

• Export
• Export Selection
• Export Regions to Files
• Export Screenshot

Export

1. Select File > Export, and the Export File dialogue box appears.
2. Make selections in the Export File dialogue box (See below for descriptions of each format option).
3. Click OK.
4. In the dialogue that opens, enter a filename in the file name field and navigate to where you wish to save the file.
5. Click Save.

Export Format Options

Bit depth

• WAV: 16 bit, 24 bit, 32 bit (float), 32 bit (int)
• AIFF: 16 bit, 24 bit, 32 bit (float), 32 bit (int)
• FLAC: 8 bit, 16 bit, 24 bit
• OGG: not applicable

Dither

• WAV: None, White Noise (TPDF), Noise shaping (MBIT+)
• AIFF: None, White Noise (TPDF), Noise shaping (MBIT+)
• FLAC: None, White Noise (TPDF), Noise shaping (MBIT+)
• OGG: not applicable

BWF

• WAV: outputs a broadcast wave format file
• AIFF: not applicable
• FLAC: not applicable
• OGG: not applicable

Compression level

• WAV: not applicable
• AIFF: not applicable
• FLAC: adjusts the compression strength of the FLAC encoder. Stronger compression requires more CPU time during file encoding but results in a slightly smaller file. FLAC compression setting does not result in any quality change to the signal since FLAC is a lossless format.
• OGG: not applicable

Quality

• WAV: not applicable
• AIFF: not applicable
• FLAC: not applicable
• OGG: adjusts the bitrate of the Vorbis compression algorithm. Higher audio quality requires a higher bitrate and results in a bigger Ogg file.

Preserve non-audio data

• WAV: exported file retains original file's metadata
• AIFF: exported file retains original file's metadata
• FLAC: not applicable
• OGG: not applicable

Reopen file in RX

• Opens the file in a new tab in RX

Export Selection

This option will allow you to export only the audio that is contained within your current selection, as opposed to the entire audio file.

1. Select File > Export Selection, and the Export File dialogue box appears.
2. Follow the additional aforementioned steps.

Export Regions to Files

This option allows you to export multiple regions of any audio file that has regions as discrete audio files. To export regions:

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1. Select File > Export Regions to Files.
2. Choose the exported file format in the Export dialogue.
3. In the File Save dialogue box, navigate to where you want to save the files.
4. If you want, enter a prefix for your series of files in the Optional prefix field. If you opt to not to add a prefix, the names of the files will be the names of the regions. If any regions have the same name, numbers will be appended sequentially.
5. Click Save.

Export Screenshot

This option allows you to export your current Spectrogram/Waveform display as a PNG image file. This can be very helpful for archiving any restoration process or for forensic documentation.

When clicking on Export Screenshot from the File menu, your current Spectrogram/Waveform view will be used for adjusting your screenshot size and position.

Note: the Spectrogram/Waveform transparency balance must be set before selecting File > Export Screenshot as this cannot be changed in this window.

To define the size of your screenshot, simply click and drag in order to enlarge or shrink the screenshot window. The dimensions of your resulting screenshot will update automatically, however these can also be entered manually by clicking once in either Width or Height.

Note: the max resolution attainable for your screenshot will be limited by the individual computer's screen resolution.

When you are finished changing the dimensions of your screenshot, click on the Save button to name and save your .PNG screenshot to your chosen directory.

To save screenshots faster (at the expense of having a larger file on disk), disable Maximum image compression.

File Info

The File Info dialogue box can be opened by clicking Window > File Info and has two sections; General Info and More Info. The More Info section lists information dependent on the file type. The following table describes the information in each section including a list of possible entries in the More Info section:

Closing a file

There are two ways to close a file:

• Close: if you close a file that has uncommitted changes (represented by a dot or asterisk next to the file name in the tab display), RX will ask you if you want to save the file. RX does not ask about saving files when the application is closed because your changes are retained in its session data.
• Close All: if you have any uncommitted changes in open files, RX will prompt you to save for every unsaved file.

The default keyboard shortcuts for the closing behaviors on Mac OS are:

• Cmd+W: closes the current file.
• Cmd+Shift+W: closes all open files quickly.

The default keyboard shortcuts for the closing behaviors on Windows are:

• Ctrl+W: closes the current file.
• Ctrl+Shift+W: closes all open files quickly.