Working with Files

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IZotope RX 2 Advanced. In addition to the base version of RX 2, an extended application, iZotope RX 2 Advanced, offers even more precise control over RX 2 algorithms as well as including iZotope's critically acclaimed 64-bit SRC sample rate conversion and MBIT+ dither for professionals who want finer control over processing and delivery. To edit audio in Reaper with RX: Right click on the audio clip you wish to edit and select 'Open Items in Editor - 'Open Items in iZotope RX.' RX should open up with the selected audio. Make any necessary changes and select 'Overwrite Original File' from the RX File menu. Nov 26, 2014  Izotope RX Interface Tips & Tricks: Scrolling, Dragging, Zooming, Dbl-Clicking. Moving around audio, finding details, changing scales quickly. Many people don't realize the timeline itself can be.

• Can anyone here horizontally scroll with their mouse wheel in Sonar? I swear that at one point, I used to be able to horizontally scroll in the clips pane and the PRV by tilting my mouse wheel. But at some point it stopped working. It may have been when I uninstalled the Logitech software and just let Windows handle the driver.
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Understanding the supported formats

The latest version of iZotope’s best-selling restoration software adds powerful new modules, as well as a Post Production Suite bundle aimed at film and TV applications. It seems that along with Christmas, another regular annual event we can rely upon is a new version of iZotope’s RX Audio Editor software. Introduction Here at iZotope, we specialize in building audio products for music production, post production and broadcast. The RX Plug-in Pack is a collection of.

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..

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.

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.

How To Scroll In Izotope Rx 7

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

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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

How To Scroll In Izotope Rx 2

• 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:

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.

Overview

The RX Audio Editor features a rich visual environment for editing and repairing audio. The central focus of the interface is the Spectrogram/Waveform display. It combines an advanced Spectrogram with a waveform transparency overlay to provide frequency and amplitude information in one highly configurable window.

Using the spectrogram to identify audio problems

• See the Identifying Audio Problems chapter for tips on using the spectrogram to spot common audio issues.
  

ANATOMY OF THE SPECTROGRAM DISPLAY

The spectrogram allows you to visualize both frequency and amplitude information of an audio recording in one display.

FREQUENCY

How To Scroll In Izotope Rx 6

The Spectrogram shows frequency information across the vertical axis. Lowest frequency content is displayed at the bottom, highest frequency content is displayed at the top.

This image shows the spectrogram of a sine sweep over pink noise. The sine sweep starts at 20 Hz (bottom of the display) and sweeps to 20 kHz (top of the display) over 4 minutes.

AMPLITUDE & COLOR

The amplitude of frequency content is indicated by variations in color in the Spectrogram. The color map ruler (to the right of the frequency ruler) shows the color being used to represent a given amplitude value.

In this example, Louder events (speech) are indicated by brighter colors (yellow/bright orange) and quieter events (breaks in speech and noise floor) are indicated by darker colors (dark orange, blue, black)

Spectrogram Settings

The RX Spectrogram is highly configurable, you can adjust the default configuration, load a preset or save your own preset in the Spectrogram Settings window.

The Spectrogram Settings window can be opened:

• From the “View” menu of the RX Audo Editor
  
• By right-clicking on the spectrogram display and selecting “Spectrogram Settings” from the context menu
  
• Using a keyboard shortcut: Command+Shift+, (on Mac) or Ctrl+Shift+,
  

• SPECTROGRAM TYPE: RX offers different methods for displaying time and frequency information in the Spectrogram. RX’s advanced Spectrogram modes allow you to see sharper time (horizontal) and frequency (vertical) resolution simultaneously. There is always a trade-off of display quality versus processing time, so keep in mind that some modes will take longer to draw on the screen than others.
  

• FFT SIZE: The greater the FFT size, the greater the frequency resolution, i.e. notes and tonal events will be clearer at larger sizes. However, choosing a larger number here will make time events less sharply defined because of the way this type of processing is done. Choosing Auto-adjustable or Multi-resolution modes allows you to get a good combination of frequency and time resolution without having to change this setting as you work.
  

What does FFT mean?

Fast Fourier Transform: a procedure for the calculation of a signal frequency spectrum. The greater the FFT size, the greater the frequency resolution, i.e., notes and tonal events will be clearer at larger sizes.

• ENABLE REASSIGNMENT: Enables a special technique for Spectrogram calculation that allows very precise pitch tracking for any harmonic components of the signal. When used together with Frequency Overlap/Time Overlap controls, this option can provide virtually unlimited time and frequency resolution simultaneously for signals consisting of tones.
  

• WINDOW: Selects between the different weighting functions (or windows) that are used for the FFT analysis. Window functions control the amount of signal leakage between frequency bins of the FFT. “Weak” windows, such as Rectangular, allow a lot of leakage, which may blur your Spectrogram vertically. “Strong” windows, such as Kaiser or cos3, eliminate leakage at the expense of a slight loss of frequency resolution.

• FREQUENCY SCALE: Using different frequency scales can help you see useful information more easily. Different scales have different characteristics for displaying the vertical (frequency) information in the Spectrogram display.

  • LINEAR: Displays frequencies spread out in a uniform way. This is most useful when you want to analyze higher frequencies.
    
  • LOGARITHMIC: this scale puts more attention on lower frequencies.
    
  • MEL: the Mel scale (derived from the word Melody) is a frequency scale based on how humans perceive sound. This selection is one of the more intuitive choices because it corresponds to how we hear differences in pitch.
    
  • BARK: the Bark scale is also based on how we perceive sound, and corresponds to a series of critical bands.
    

• FREQUENCY OVERLAP: Controls the amount of oversampling on the frequency scale of Spectrogram. When used together with the Reassignment option, it will increase the resolution of the Spectrogram vertically (by frequency).

• TIME OVERLAP: This controls the time oversampling of the Spectrogram. In most cases, overlap of 4x or 8x is a good setting to start with. However, using higher overlap together with the Reassignment option will increase the time resolution of a Spectrogram, letting you see transient events clearly.

• COLOR MAP: The Spectrogram display allows you to choose between several different color schemes. There is no right or wrong color setting to use and we recommend you try them all to determine your preference. Sometimes certain color modes will make different types of noise stand out more clearly. Experiment!

• HIGH-QUALITY RENDERING: Accurate max-bilinear interpolation of the Spectrogram (recommended). Turning this control off makes Spectrogram rendering slightly faster, but you’ll lose some detail and clarity in the Spectrogram image.

• REDUCE QUALITY ABOVE: RX’s Spectrogram uses very accurate rendering, letting you see audio problems, such as clicks, even at low zoom levels. However, performing such rendering for long files can be somewhat slow. When the length of the visible Spectrogram is above the specified number of seconds, the Spectrogram calculation is changed to a fast and less accurate preview mode. When you zoom in, the Spectrogram calculation becomes accurate again.

• CACHE SIZE (MB): Limits the amount of memory used by the Spectrogram.

Rulers

On the right side of the Spectrogram/Waveform display are the Amplitude ruler for the Waveform, Frequency ruler for the Spectrogram, and Color Map ruler for the Spectrogram.

Amplitude Rulers

You can right-click on the spectral Amplitude ruler to reveal a selection of amplitude scales:

• dB: Shows Waveform levels in decibels, relative to digital full scale (it is the most common type of scale used for spectrum analyzers).
  
• NORMALIZED: Shows Waveform levels relative to the full scale level of 1.
  
• 16 BIT: Shows Waveform levels as quantization steps of a 16-bit audio format (−32768 to +32767).
  
• PERCENT: Shows Waveform levels as percentage from full scale.
  

Color Map Ruler

This ruler shows what color represents what amplitude in the Spectrogram. The range of this display is the dynamic range of the RX Spectrogram. You can click and drag the map to change the range and use the scroll wheel to make the range larger or smaller. This is useful for seeing very quiet noises without using gain to change the level of your audio.

Frequency Rulers

Right-clicking on the frequency ruler will display the frequency scale options:

• LINEAR: Linear scale means that Hertz are linearly spaced on a screen.
  

• MEL (default) & BARK: Mel and Bark are frequency scales commonly found in psychoacoustics, and reflect how our ears detect pitch. They are approximately linear below 500 Hz and approximately logarithmic above 500 Hz.

  • MEL scale reflects our perception of pitch: equal subjective pitch increments produce equal increments in screen coordinates.
    
  • BARK scale reflects our subjective loudness perception and energy integration. It is similar to Mel scale, but puts more emphasis on low frequencies.
    

• LOG: in this mode, different octaves occupy equal screen space. The screen coordinates are proportional to the logarithm of Hertz down to 100 Hz.

• EXTENDED LOG: this extends the logarithmic scale down to 10 Hz, so that it puts even more attention on lower frequencies.

• PIANO ROLL OVERLAY: A representation of how specific frequency ranges correlate to the western musical scale can be displayed by right-clicking on the Frequency ruler and selecting Show Piano Roll. If you would like to hide the frequency indicators so they don’t obscure this piano roll, you can disable Show Frequencies and Ticks (which is enabled by default).

Waveform Displays

Waveform Transparency Balance Slider

The Spectrogram Display features a transparency slider that lets you superimpose a Waveform display over the Spectrogram, allowing you to see both frequency and overall amplitude at the same time. This can be invaluable for quickly identifying clipping, clicks and pops, and other events.

Below are examples of the same clip shown with different transparency balance values:

Waveform Overview

An overview of the entire audio file’s Waveform is displayed above the main Spectrogram/Waveform display in order to provide a handy reference point when zooming and making audio selections in RX.

The Waveform overview will always display the entire audio file, and will also display any selections made in the main display.

How To Scroll In Izotope Rx 1

When zooming in on your audio, the currently visible audio region will also be highlighted in the Waveform overview. Click and drag on the highlighted region in order to scroll your main audio display left or right, and click and drag on the edges of the highlighted region in order to make the zoom tighter or wider. To zoom out fully, simply double click on the highlighted visible region.

Note

With your mouse hovering over the Waveform overview, you can also use the mouse wheel to scale the amplitude of the Waveform display to provide a clearer overview. This will not affect the amplitude scaling in the main Spectrogram/Waveform display.