Select a short passage
Open the audio in the waveform editor and select a representative range. Keep the original file.
Choose the Delay effect
Open Delay and preview the effect. Adjust the available delay time, feedback and mix controls modestly; use the Classic preset as a starting point if useful.
Apply and review
Apply the setting, listen across the selection boundaries and use Undo if the repeats obscure useful detail. Export a new copy once the result is suitable.
All included application features are 100% free. No registration or activation is required.