Echo: Shape Feedback Colour and Groove

Start below the runaway region

Echo and Delay do not share the same feedback calibration. Here the internal loop gain is 1.62 times the Feedback dial: 30% means roughly 0.486 before filtering. Around 62% the unattenuated loop crosses unity and can grow instead of fading. Filtering may reduce some frequencies, but it is not a reason to assume high settings are safe. Keep monitoring modest and use 20–40% for this lesson.

The first example sends original synthetic drums through independent 250 ms left and 375 ms right delays. Sync and Link are off, Feedback is 30%, and Dry/Wet is 30%. HP at 350 Hz and LP at 3.5 kHz remove extremes from the repeats. The source has deliberate rests; no external drum recording is needed to hear the trail.

Two edits that reveal where the colour happens

1. Raise LP from 3.5 to 8 kHz. Follow the bright edge of each drum reply. Then lower it to 2 kHz and compare the last repeat with the first. The filters are in the feedback path, so the tone is shaped again on each circulation.
2. Leave LP at 3.5 kHz and move HP from 350 to 700 Hz. Listen for less low body in the trail while the direct hit stays present. Return toward 350 Hz if the reply becomes only a thin tick.

Now enable Link. Both delays follow the left time, removing the different left/right rhythmic spacing. If that feels clearer, the problem was competing replies, not necessarily excess treble. Turn Link back off when the staggered answer is doing useful work. Always compare with the same input level: raising Input feeds more signal into the effect, and is not a documented tape-drive control.

A string-like answer that moves rather than shouts

This second source is a synthetic guitar-like phrase, not a recorded performance. Ping Pong, linked three-sixteenth timing and 28% Feedback set a restrained repeating pattern. Mod Rate starts at 0.7 Hz and Mod Dly at 18%, adding time movement to the wet reply. The original sound remains a useful pitch reference.

Open the Modulation tab. Set Mod Dly to zero, then restore 18%. Listen to the sustained part of the reply rather than the attack. Moving delay time changes pitch; a slow sweep can make the trail less static, but too much makes a stable note sound unsettled. Try 35% briefly, then return toward zero if the echo seems out of tune. Mod Rate changes the speed of this movement, not the spacing between repeats.

Keep the extra layers optional

Reverb starts at zero in both examples so its smear cannot hide the timing experiment. Open Character for these controls. For a different texture, raise Reverb to about 10% with its location set to Post. Compare that with Pre at a similar perceived level. Feedback placement instead sends reverb back into the repeat loop; reduce Feedback first, because that changes what recirculates rather than merely adding an output tail.

Ducking offers another route to clarity by reducing wet output in response to the dry input. It does not shorten the stored feedback trail. Try Duck on and adjust Duck Thr until replies tuck behind attacks, then use Duck Rel to control their return. Back off if the background audibly pumps between notes. Choose the simpler fix first: a lower wet level or less Feedback may already leave enough space.