SpiralSynth is capable of creating the kind of sounds made by hardware analogue synths, the noises used in electronic music. You can also use it to make stranger sounds too.

MIDI is supported, including velocity detection, mapped to the volume of the oscillators (But you can also use the PC keyboard to play the synth).

You can save and recall your sounds using the 100 patch save slots, and render WAV files directly to disk.