Additionally, the Monotron allows any audio device to be patched in and processed via its auxiliary port.
The Monotron's classic analogue filter allows it to offer the same vintage analogue sound found in some of Korg's classic analogue devices. Its acclaimed VCF circuit, too, helps to provide a classic analogue tone by adding extra emphasis to the resonance while allowing users to adjust the frequency or tone of the filter. Meanwhile, the Monotron's auxiliary port allows it to process most modern audio devices or even a guitar or other instrument.