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nvk_AUTODOPPLER 2

Generate doppler automation for items in Reaper

Doppler passes are slow to draw by hand, and slower when you need a batch of variations. The script finds the peak of each item on a track and writes the doppler automation around it. Then you adjust it with sliders, randomize it, and render.

Purchases go through Gumroad.com

Try it free: install guide

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nvk_AUTODOPPLER 2 controls next to the nvk_DOPPLER plug-in and supported third-party doppler plug-ins

Try the main controls

Attack, Release, Offset, and Amount work like the sliders in the script. Press play to hear a pass that follows the curve. Below it, the same settings are applied to every item on a track.

The sound is synthesized in your browser to show the shape of the curve. Use headphones to hear the pan. In Reaper, the script writes this automation to the plug-in you pick.

How it works

  1. Select a track

    Select the track with your items. If it's a folder, the script includes the child tracks. Make a time selection to work on part of the track.

  2. Run nvk_AUTODOPPLER

    It finds each item's RMS peak, or uses its snap offset, and writes automation for every item at once. The automation updates as you move the sliders.

  3. Render

    Render the time selection, or the whole track. With Split takes on, each item gets its own take.

Features

  • Peak detection

    Uses each item's RMS peak, or its snap offset if you've set one. Offset moves the peak earlier or later.

  • Envelope and playrate sliders

    Attack, Release, Offset, and Hold shape the envelope. Amount and Multiplier set the playrate swing. Changes apply to every item on the track or folder.

  • Randomize

    Press R to randomize all sliders. Each slider has its own randomization amount, and per-item randomizing gives every item in a batch different settings.

  • Quick Render

    Renders the selected items with your last settings, without opening the window. With one item selected, the peak goes where you place the edit cursor.

  • Custom mode

    nvk_AUTODOPPLER - Custom writes the same automation to any FX parameter you touch, such as a filter cutoff or a reverb mix.

  • Saved with the project

    Settings are stored on the track, the project, and each item, so reopening the script picks up where you left off.

Supported plug-ins

Choose the plug-in from a menu in the script. The sliders change to match it.

*Sound Particles Doppler plays back and renders one doppler at a time.

Included

nvk_DOPPLER

A doppler effect that works by modulating Reaper's playrate, so the pitch can swing much further than a conventional plug-in allows, with no latency or buffer. It has volume, pan, and air controls, plus dry mix, tremolo, compression, and a limiter.

The nvk_DOPPLER plug-in window: Volume, Pan, and Air knobs under Doppler, Dry, Tremolo, Compress, and a Limit switch under FX, beside a waveform display

Video walkthrough

There's also a video on using it with Tonsturm DopplerPRO (opens in a new tab).

FAQ

Can I try it before buying?

Yes. The script includes a 14-day trial with no card required. Install it by following the install guide, then run it in Reaper. When the license prompt appears, leave the field blank and click OK.

Do I need a third-party doppler plug-in?

No. nvk_DOPPLER is included. The third-party plug-ins listed above are optional.

Which versions of Reaper and which systems are supported?

Reaper 7 or later on macOS and Windows.

What do I need before installing?

Reaper, ReaPack, the SWS/S&M Extension, ReaImGui, and the js_ReaScript API. The scripts install through ReaPack; the install guide walks through every step.

Can I use my license on more than one computer?

Yes. Each seat may be activated on up to four computers at a time, all used by the same person.

Can I buy licenses for a team?

Yes. Use the team license option at the bottom of this page to choose how many people need it, and you'll get one multi-user key. Questions? Email support@nvk.tools.

nvk_AUTODOPPLER 2

Includes the nvk_DOPPLER plug-in and updates through ReaPack. Try it free for 14 days before you buy.

Purchases go through Gumroad.com

Buying for a team? Choose how many people need it and you'll get one multi-user key. Each person can use it on up to four of their own computers. $49 per license.

The Sound Design Bundle includes nvk_AUTODOPPLER 2 and nvk_CREATE for less than buying them separately.

See the bundle