Ping-pong delay timing: beat spacing across two speakers

For an alternating ping-pong delay at 120 BPM, an eighth-note interval is 250 ms. If each successive echo switches sides, you hear left, right, left, right at 250 ms intervals. The echo returns to the same speaker every 500 ms. That longer same-side interval is a common reason the effect can seem slower than its setting.

This describes a simple alternating-repeat model. Different processors route the initial input and feedback differently, so verify what your delay’s time parameter controls before applying the example to it.

Separate echo spacing from a complete left-right cycle

Imagine one short, centered dry click at time zero. Assume the first delayed copy appears on the left after 250 ms, then each repeat crosses to the opposite side after another 250 ms.

Time after dry click	Event
0 ms	Dry click in the center
250 ms	First echo on the left
500 ms	Second echo on the right
750 ms	Third echo on the left
1,000 ms	Fourth echo on the right

Across both speakers, the echoes follow eighth notes at 120 BPM. Listening to only the left channel gives echoes at 250 and 750 ms: a quarter-note interval. The same is true of the right channel at 500 and 1,000 ms.

If you want each speaker to repeat on eighth notes while they alternate evenly, the combined stream would need a shorter interval. In this model, 125 ms between adjacent echoes returns to each side every 250 ms. Decide which event you want aligned to the beat before changing the setting.

Choose the musical interval

The usual note-duration formulas still apply. Stereo placement changes where an echo appears, not the length of a quarter note.

Division at 120 BPM	Gap between alternating echoes	Return to the same side
Sixteenth note	125 ms	250 ms
Eighth note	250 ms	500 ms
Dotted eighth	375 ms	750 ms
Quarter note	500 ms	1,000 ms

The last column assumes equal alternating gaps. Use the BPM to MS calculator for another tempo, and check whether your plugin’s synced value refers to each delay line or the audible spacing of successive repeats.

A dotted setting can move through different positions against the beat. The dotted-eighth guitar guide shows that timing relationship with a picked phrase; stereo movement adds another dimension to the same rhythmic interval.

Test the routing with one short sound

A dense stereo pad makes it difficult to identify individual echoes. Use a short click, muted note, or rimshot while setting up the effect, then restore the musical source afterward.

1. Choose a moderate feedback level so that several repeats remain audible.
2. Disable extra modulation or diffusion while checking timing, if the processor provides those controls.
3. Send one short mono sound into the delay and stop the source.
4. Listen to the stereo result, then each channel separately. Note where the first echo appears and how long it takes to return to that side.
5. If the pattern differs from the example, inspect the device’s stereo link, input, cross-feedback, and ping-pong settings.

Recording the wet output onto a stereo track can make the sequence easy to inspect. The left and right waveforms reveal whether the first echo is on one side, both sides, or offset in some other way. Measure between the repeated transients instead of assuming a button label fully specifies the routing.

Two different channel times make another pattern

Some stereo delays let you choose separate left and right times. Setting one side to a quarter note and the other to a dotted eighth creates two rhythmic streams, or a more complex feedback pattern if the channels feed each other.

That can sound good, but you can no longer assume every adjacent echo is separated by one common interval. The simple “same side equals twice the delay” relationship above applies only to evenly spaced alternating repeats.

Start with linked or equal times if your aim is an obvious side-to-side bounce. Introduce unequal times after you can identify the basic pattern, and listen for collisions with the lead phrase rather than choosing values only because both are tempo-related.

Keep the stereo effect useful in the mix

On a standard send/return, make the delay fully wet and use the send or return level to balance it with the dry track. On an insert, use the effect’s dry/wet control. These approaches help prevent an unintended extra dry copy from changing the source level.

Check the result in mono. The left-right movement will disappear, and routing, filtering, or modulation may change how the summed repeats sound. You still want the timing and level to support the part when the stereo image is unavailable.

Finally, test a phrase ending and a busy section. Higher feedback carries more material into later beats; lowering it can clear the arrangement without changing the delay time. For a broader explanation of repeat spacing, use the delay-time workflow, then return to the stereo test whenever the apparent rhythm and the displayed setting disagree.