Keyboard Sounds Free is a virtual keyboard with high quality instruments and low latency: Piano. Oboe. The pro version adds support for MIDI keyboards via USB, a MIDI file player and the following instruments: Flute. Violin. Harp. Guitar. Fretless bass. Bandoneon. Sitar. You can download a trial version from. We also offer other music apps. For details, see refined-apps. Com.