SpaceTheremin is a virtual mouse-controlled theremin.
Unlike a standard analog theremin, which typically has
a sinewave oscillator and some basic vibrato,
SpaceTheremin lets you choose from six different
oscillator types (sine, square, triangle, sinc, saw,
and pulse). The same waveforms can also be used for
vibrato and modulation. It uses PortAudio for sound
generation and works on versions of Windows from XP
through Windows 10.

Use of the vibrato can result in some incredibly
freaky and bizarre sounds. Set the vibrato depth (in
percent) and adjust the vibrato frequency via the
slider to hear the effects. A vibrato depth of 50% and
a triangle waveform gives an interesting sound, for
example.

Although the vibrato frequency ranges from 0.1 to 12.0
Hz in 0.1 Hz increments, checking the "modulation" box
changes the range maximum to 8000. Moving this slider
into the audible frequency range (20Hz and up) allows

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