The current Echo Doppler models a single sound source moving linearly away. Future iterations could incorporate:

In scratch DJing, the “transform” and “echo fade” are classic techniques. The Echo Doppler automates the manual fader movement and pitch change of a vinyl record being slowed down. A DJ can emulate the sound of a record stopping (the “brake” effect) by setting pitch depth to -24 semitones and feedback to 0%, creating a single downward-spiraling repeat.

Using the "receding" sound to wash out a track while bringing in a new beat.

This is a famous trick in Open Format and Top 40 DJing.

Creates a rhythmic tail that matches most modern dance tracks. Thins out the echo so the vocal or lead stays crisp. Dry/Wet Balances the original track with the echo effect. Expert Transition Technique: The "Echo Out" Virtual Dj Echo Doppler

: You can download the plugin from the VirtualDJ Extensions page.

When Virtual DJ combines Echo with the Doppler Effect, the software simulates the sound source moving past you at high speed. The repeats aren't static; they quickly ramp down in pitch as if the sound is spinning away from you into a tunnel.