Frequency modulating software synthesizer. Carrier and modulator oscillators supporting multiple waveform shapes, including sine, square, and sawtooth. ADSR amplitude envelope and amplitude value vs time display. Direct graphics system including an implementation of basic primitives (lines and circles) along with an immediate mode widget system, including buttons, sliders, knobs, and checkboxes. Text support implemented using bitmap glyphs.

Download Click for Windows or Mac. Notes are played using the keyboard like a piano. For example, pressing the 'z' key will play a C note, and 's' a C#.