drop_out audio has released MonoDelay, a lo-fi delay, synth, and noise instrument inspired by Korg’s cult toy synth/delay.
MonoDelay is the first release from drop_out audio, a one-person plugin company founded by Martijn Kerkhof in the Netherlands.
This is not a free plugin, but the 14-day trial is fully functional and has no audio drop-outs, so you can properly test it before deciding whether it fits your workflow. MonoDelay is available at an introductory price of €39/$45 until July 15th, after which the regular price will be €49/$60.
It’s not hard to figure out that the plugin is inspired by the Korg Monotron. MonoDelay doesn’t claim to be a faithful PT2399 chip emulation, but it aims to preserve the feel of that kind of signal path.
It is mono by design, the delay is free-running rather than host-synced, and the tone gets dirtier as the delay time increases.
That means MonoDelay is not the plugin to reach for when you need a polished stereo delay locked tightly to the grid. Just like the original, it is all about the lo-fi character, dub-style feedback, degraded textures, weird noises, and small accidents that can make a track more interesting.
The delay time runs up to one second, and the feedback can go up to 110% for overloaded or effectively infinite feedback. Longer delays introduce more degradation, and the signal path includes a slight noise floor, limited dynamic range, and band-filtered tone instead of hiding those imperfections.
MonoDelay also includes a resonant filter with cutoff and peak controls on the feedback path. You can darken the repeats, push the filter into more aggressive territory, or brighten things up when you want the echoes to cut through.
And of course, the Dry/Wet control makes it easy to blend the effect without extra routing.
The built-in LFO section adds Shape, Speed, and Depth controls, with saw and pulse-style modulation. In synth mode, it can modulate pitch or filter; in FX mode, it modulates the filter.
The synth side uses a ribbon-style keyboard for smooth note movement, and notes played from a keyboard are recordable. You can choose sine, triangle, saw, or square waveforms, so MonoDelay can work as a small lo-fi synth, an effect unit, or a noise generator.
MonoDelay is available in VST3 format for Windows 10/11 and AU/VST3 formats for macOS. The Mac version runs Apple Silicon natively, with Intel support via Rosetta, and the plugin supports sample rates from 44.1 kHz to 192 kHz.
Download: drop_out audio MonoDelay (€39/$45)
Last Updated on June 15, 2026 by Tomislav Zlatic.
