Monstrous is an atmospheric horror synthesizer designed to create immersive and chilling soundscapes. It features a large 1.2GB sound library that includes a wide range of instruments, sound effects, percussion, and ambient textures. This extensive collection allows producers to craft haunting audio experiences that are ideal for horror-themed projects, film scores, and dark electronic music.

The synth engine includes three layers, each with its own MIDI channel selector, amplitude envelope, detune, and pan controls. Users can shape their sounds further with three advanced filters that feature ADSR control, enabling precise tonal sculpting. The inclusion of velocity response and MIDI automation support provides expressive performance capabilities, making it easy to integrate with control surfaces and tailor sounds dynamically.

Monstrous also offers a range of effects to enhance the atmosphere, including two send effects—chorus and delay—and a unique Preverb effect that functions similarly to reverb but can also be used as a send. Additionally, two master effects, a smooth reverb and tempo-synced delay, help polish the final sound. These features combine to deliver a powerful toolset for creating eerie, cinematic audio environments.