M-ST is an audio effect plugin designed to effortlessly adjust the stereo width of any audio signal. It allows users to fine-tune the stereo separation continuously, providing more control than a simple mono-stereo switch. This makes it easy to enhance the spatial dimension of your mix or create a wider soundstage with subtle or dramatic widening effects.

When pushed beyond 100% stereo width, M-ST employs a combination of mid/side processing, filtering, and delay lines to expand the stereo image while maintaining mono compatibility. This ensures that the enriched stereo content remains balanced and clear when collapsed back to mono. Additionally, the plugin can transform a mono input into a convincing fake stereo signal, broadening the perceived depth and presence of single-channel sources.

M-ST is distributed as a free plugin without any adware, spyware, or hidden limitations, making it a reliable tool for producers and engineers. Built with a stable framework, it avoids common issues such as multicore processing bugs, ensuring smooth performance in various digital audio workstations. Its straightforward functionality and clean design make it an excellent choice for quick stereo enhancement tasks.