MIDI Choir transforms a single-pitched audio input into rich harmonies by transposing it in real time based on MIDI notes. Designed primarily to enable live singing of harmonies, this application also excels in studio environments. It utilizes a reliable pitch tracker that distinguishes voiced from unvoiced audio, ensuring a natural and clear sound. The software supports unlimited polyphonic voices and offers precise control over octave, semitone, and fine-tuning adjustments.

To enhance audio quality, MIDI Choir features a built-in noise gate, soft-knee compressor, and stereo reverb with customizable parameters such as room size, damping, and stereo width. Visual indicators provide feedback on pitch tracking, noise gating, limiting, and output clipping, making it user-friendly for both live and recorded settings. Users can also apply effects independently of MIDI input, and the software is available as a VST plugin or a standalone application.

Recent updates have brought significant improvements, including a completely redesigned rendering engine that enhances pitch modification and sibilant processing. The latest version introduces a new soft-knee lookahead compressor and updated reverb for a more refined sound. Additionally, the software now offers both 32-bit and 64-bit VST plugin versions to accommodate modern production workflows, alongside ongoing bug fixes to ensure stability and performance.