Harmor is an additive synthesis-driven virtual synthesizer plug-in from Image-Line that can be manipulated by editing graphical representations of its various parameters. It is compatible with Windows only and can be run standalone or within your VST-compatible host software.
Harmor's parameters resemble those of a subtractive synthesizer, but its various oscillators and filters are actually driven by an additive synthesis engine. While additive synthesis is generally known to be processor-intensive, Harmor's engine is built for efficiency, comparable to that of subtractive synthesizers.
Harmor's unique "image synthesis" feature allows you to tweak your sounds using up to 500 envelopes simultaneously, simply by editing 2D graphical representations of the parameters. You can also import your own images to change Harmor's behavior and create new sounds.