KQ Sampei is a sampler synthesizer offering versatile sound sets and multi-timbral capabilities. It supports formats like Sound Font(sf2), Compressed Sound Font(sf3), and Downloadable Sound(DLS). The program includes a MIDI File Player, accommodating Standard MIDI Files and RIFF MIDI Files with support for multiple ports and loops.

Customize sound sets with "Modifiers" like adding a soft pedal function and GS Custom Controller mod. KQ Sampei supports Audio Unit v3 and Inter-App Audio, allowing integration as a plugin for apps such as GarageBand and Cubasis. Additionally, it facilitates Micro-tuning by placing AnaMark TUN files into the Tuning folder.

With the ability to use sound sets based on device memory and support for external MIDI devices and Virtual MIDI apps, KQ Sampei offers a comprehensive music production experience. The app developer emphasizes user privacy, collecting only necessary information as per iOS/iPadOS standards.