CMP Grand Piano is a high-quality virtual piano sound module designed for professional usage on the iPhone. It offers a realistic sound by utilizing a large collection of audio samples, totaling more than 1.7 GB in size. The app features two high-quality base sounds, "Grand Piano" and "Jazz Piano," with an additional two sounds available as in-app purchases. With a polyphony of up to 140 stereo voices and configurable audio latency down to 5ms, CMP Grand Piano provides a seamless and responsive playing experience.

In addition to its impressive sound quality, CMP Grand Piano supports various MIDI connections, including Bluetooth LE MIDI, Audio Unit, Audiobus, Apple's "Inter-App Audio" system, and the "JACK Audio Connection Kit." This allows users to connect the app to other audio apps and devices for a more integrated and versatile music-making experience.

The app also includes a MIDI player and recorder, allowing users to record, save, and load songs in standard MIDI file format. With unlimited tracks and recording/playback length, users can create and edit their compositions with ease. The app even supports MIDI file import from other apps, such as Safari and Mail, making it convenient for users to access and play their favorite songs.

With its comprehensive features and high-quality sound, CMP Grand Piano is a top choice for musicians and music enthusiasts looking for a professional virtual piano experience on their iPhone.