It uses the Windows or sound-card Synthesizer.

It can use the excellent and free SyFonOne, which can synthesize and play any SoundFont sounds.

It can use the excellent and free VSTHost, which can synthesize and play any VST plugin sounds.

PianoRollComposer can play and display any MIDI music.

Music created with PianoRollComposer can be played by any MIDI player.

It uses the standard treble and bass clef staffs. Notes are displayed in the piano roll format, so it shows music with absolute accuracy.

Notes can be entered directly on the staffs, and you can edit each note to give it the exact characteristics you want.

If you have a MIDI keyboard, you can play and record any instrument with it (there's also an on-screen keyboard).

It can use any of the 128 General MIDI instruments and 61 MIDI percussion instruments.

Up to 16 different instruments can show and play at the same time.

It can Record To, Play, and Merge WAVE files at up to 44.1kHz/24 bits.

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