May 31, 2019 The field recording Slack had a fun challenge this month to isolate sounds from a recording. I used Izotope Rx 6 to do this. Jump to 30:00 to hear the birds in isolation after extensive de-noising.
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- Izotope Rx Field Recording Software
- Izotope Rx Field Recording System
Recently, I stepped away from my mixing duties to report a piece for WHYY, an NPR station based out of Philadelphia. The gig got me out of the studio, recording interviews in a variety of locations, and dusting off a bag of in-the-field tricks that might be of some benefit to you.
If this sort of work intrigues you—interviewing people in the field for radio and podcasts and the like—read on. We’ll cover the right tools for the job and some good techniques for getting a quality sound.
After adjusting your input levels, you can start recording by clicking the Record button again. When RX is recording, the Record button will display as solid red. You can stop recording by clicking the Record button again. Apr 18, 2019 We all know iZotope RX as the popular choice for noise reduction—classical music, field recording, to name a few. But what if we tell you that there is more to RX than being the go-to for audio repair and restoration? RX has earned its place in the mastering engineer's toolbox thanks to its surgical precision. The renowned RX suite just got a major update, with several new improvements and additions. IZotope RX7 is an absolute essential suite, no matter if you’re working on music, field recording, sound design or audio post production, it can save not only a lot of time (avoiding re-recording), but it can literally fix problems transparently in. IZotope RX was designed to repair audio. It does this by approaching damaged audio by the nature of the problem, in separate “modules.” In other words, if you have a hissy, clipped recording, you first use the Declip module, then the Denoising module.
![Izotope Izotope](https://www.fieldrecording.de/wp-content/uploads/2014/09/izotope-rx4-standard-advanced-iu.jpg)
What is a tape sync?
If you listen to talk radio like NPR, podcasts from outlets like Gimlet, and similar fare, you’ve heard the results of a tape sync: It sounds like two people sitting down in the same room for an interview. This is but an illusion: the interviews have been recorded in different locations, only to be spliced together later to sound like a congenial tete-a-tete. Often the host sits in a studio, recording their end of the interview as they hold a phone to their ear. At the same time, the guest sits elsewhere (their house, a library, or some other location), talking to the host over the phone.
![Izotope Izotope](https://www.creativefieldrecording.com/wp-content/uploads/2014/12/RX4-Loudness-1.png)
Here’s where you come in: you, the recording engineer, have traveled to the guest’s locale. You capture the audio on their end. You hold a shotgun mic to their face, or you ensure they talk correctly into a mic situated on a desktop stand, all while monitoring the levels, angling the mic for the best sound, and interjecting if things get too noisy.
This is a tape sync (also called a phone sync, a double ender, a simul-rec, and some other hyphenates that sound equally confusing). Let’s cover what you’ll need to do one.
1. Tools needed for a tape sync
If you’re the owner of a Spire Studio, you already have a tool that can be used, in a pinch, for tape-syncs. It can come in handy while you’re first getting your feet wet in the game. Later on, when you’ve chosen to purchase a dedicated recorder for this sort of work, the Spire can be your backup recorder in times of limited battery life or unexpected malfunctions. A real engineer knows that the difference between an amateur and a pro often lies in the backups!
Whether you’re recording your own interviews or diving into the tape-sync world, you should have the following on hand:
Whether you’re recording your own interviews or diving into the tape-sync world, you should have the following on hand:
Understanding the Preferences menu
Audio
Driver Type
Allows you to select a sound card driver model to use for playback and recording.
Note: Some hardware devices monopolize the audio drivers when sending audio clips to RX via RX Connect. If you are not able to hear the audio sent to RX from your DAW via RX Connect, change the audio driver to RX Monitor in the Driver type menu. See RX Monitor.
The rest of the dialog contains settings for your audio device and also includes a test tone generator.
Input/Output Device
Choose the device/sound card you want RX to use for playback and recording.
Buffer Size
The total playback buffer size. In general, lowering these buffer sizes will improve meter responsiveness and lower latency, but increase CPU needs. Raising buffer sizes will lower CPU cost but increase latency. It's worth exploring these ranges to find values that work best on your system.
Num Buffers
Number of playback sub-buffers. (MME Only.)
Channel Routing
For ASIO and CoreAudio drivers, click this button to choose which input and output channels RX uses. Click the Channel Routing button to open the Channel Routing dialog box.
Configure Driver
Launches the manufacturer’s driver configuration dialog.
Release when not in use
Auto-closes the audio device when playback in RX stops, freeing it for use in other audio applications. Disable this if playback from RX isn’t responsive enough.
Test Tone
The test tone generator is useful for testing your speakers, audio hardware and listening environment. Tones at set frequencies or at a custom frequency can be used as test tones, as can white or pink noise. In addition, a Channel Identification mode will identify left and right speakers.
Enable
Starts playback of a test tone.
Type
Sets the type of test tone to play.
Volume
Sets the volume of the test tone.
Frequency
Sets the frequency of the test tone.
Output Gain
Output gain allows you to nondestructively adjust the playback level of RX 5 Audio Editor.
Display
Show tooltips
When enabled, hovering over an RX feature with the mouse cursor will show a short description of the feature.
Display cursor coordinates in status bar
When this is enabled, the time coordinate of the cursor is shown in the status bar at the bottom of the RX main window. The amplitude of the audio at the cursor position and the frequency at the cursor position is also shown.
Show analog waveform
When digital audio is played back, it is converted to analog. The peak values in the analog waveform can be larger than the peaks in the digital waveform, leading to clipping in the output of a digital-to-analog converter. When Show analog waveform is enabled, RX will compute an analog waveform in the background. Any peaks will be highlighted in red on top of the existing digital waveform.
At very extreme zoom levels, RX always displays an analog waveform.
Offload waveform calculations
When this is enabled, RX's waveform display will be computed in the background. This allows very large files to be loaded very quickly, but it slows down RX's waveform displays.
Waveform interpolation order
If you zoom into the waveform so that individual samples become visible, RX will display an upsampled analog waveform as well as the individual digital samples. The interpolation order controls the quality of upsampling. Higher values yield more accurate analog waveforms at the expense of CPU usage.
Brightness
Adjusts the general brightness of the RX interface, allowing you to make RX more readable on your specific display.
Floating window opacity
Changes the opacity for RX's floating windows. This can be useful if you wish to leave floating windows on top of the spectrogram and waveform without completely obscuring the display.
Keyboard Shortcuts
While RX includes default keyboard shortcuts, you can also customize them to your liking.
Presets
Save groups of key assignments with this tool.
Show commands containing
Lets you search by keyword for a command you want to assign to a keystroke.
Shortcuts for selected command
Shows if there are any keystrokes assigned to the command selected in the above menu.
Remove
Removes the currently assigned keystroke from a command.
Press Shortcut Key
To assign a new keystroke to a command, select the command from the menu, then click in this field and press a key or combination of keys.
Assign
Assigns the entered keystroke to the current command. The shortcut will only be assigned to the current command if you press this button.
Shortcut key currently used by
Lists commands that the current keystroke is assigned to.
Note: On Windows systems, by default, 'Alt + a letter' will open the corresponding menu for your currently open application. Alt + V for example will open RX's View menu drop down. By default, none of RX's shortcuts should conflict with these keyboard shortcuts, however if you wish to assign Alt + V to another operation, it will take precedence over the View menu.
Miscellaneous
Session data folder
Allows you to choose a different folder to save RX's temporary session data. These files are created to allow actions to be undone and sessions to be recalled in RX. Because these can be very large, it is best to set this to the drive on your computer with the most free space.
Time scale frame rate
This sets the frame rate used to draw the time scale when RX is set to display the time code (see View menu or right-click the time ruler to change this setting). Choose from a list of standard frame rates or click in the combo box to define a custom frame rate.
Default full-bandwidth paste mode
This controls RX's behavior when pasting a full-bandwidth audio selection. Insert will move aside existing audio, Replace will overwrite existing audio, and Mix will add to existing audio.
Default limited-bandwidth paste mode
Similar to the full-bandwidth paste mode, this controls RX's behavior when pasting a limited-bandwidth audio selected.
Resume last editing session when app starts
On RX's start-up, the last audio file will be reloaded along with full history list of any edits made.
Automatically open files ending with .L and .R as split stereo
Mono audio files with (.L and .R) as well as (.1 and .2) extensions will be opened as stereo files when this option is enabled.
Recall selections during undo/redo
When this is enabled, RX will recall the selection used for an item in the undo history. When browsing the undo history, the selected region will be restored along with the audio.
Sometimes it is useful to turn this off if you need to compare undo history items and not break your current selection (like a useful loop).
Play only selected channels
If only a single channel of audio is selected and this option is enabled, all other channels will be muted during playback.
Calculate RMS using AES-17
Uses the AES-17 1998 standard for RMS calculations (0 dB is a full scale sine wave) in the level meter, Waveform Statistics and Leveler modules. The other option is when 0 dB is the RMS of a full-scale square wave. These options differ by 3 dB.
Pre- and Post-Roll during preview (ms)
When Previewing audio processing in any module, the specified time amount will be added to the beginning and end of the previewed selection in order to provide contrast between unprocessed and preview-processed audio.
Selection Feathering (ms)
This control allows for crossfading of processed and unprocessed audio when processing. If you need to make more precise edits, set this to 0.
Authorization & Updates
Izotope Rx Field Recording System
This tab enables you to authorize and deauthorize the software, as explained Authorization.
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Plug-ins
Use these options to manage your third party audio processing plug-ins.
VST/Audio Unit/DirectX plug-ins
These areas show what plug-ins are available for the specified format, which may vary depending on your OS. You can also enable or disable every plug-in for the specified format using the Enable/Disable button.
VST plug-in folders
Izotope Rx Field Recording Machine
Lets you add or remove custom VST plug-in folders. RX uses the system VST plug-in folder by default. If your VST plug-ins do not show up, try using this option to add the directory where they are kept.
Izotope Rx Field Recording Video
RX will also scan the first level of subfolders in this folder. If some of your plug-ins do not show up when you scan them, and you know they’re in a subfolder of your plug-in folder, try moving them up one directory level.
Group plug-ins by name in plug-in menus
When enabled, the RX plug-in menu will group plug-ins by common first words, usually the manufacturer’s name.
Izotope Rx Field Recording Software
When disabled, the RX plug-in menu will appear as a single, alphabetically sorted list.
Rescan
Izotope Rx Field Recording System
If RX detects that a plug-in is unstable, it will blacklist it and prevent it from being opened.
This option allows you to clear RX’s blacklist of unsupported plug-ins and rescan all installed plug-ins in case an RX update or an update from the plug-in manufacturer resolves the issue.