696Audio has released IO Singularity, a virtual analog synth VST instrument plug-in for Windows.

Features:

• Two oscillators with 4 selectable waveforms (saw, sine, triangle, square, and the second oscillator has noise).
• Selectable sub-oscillator.
• ADSR.
• Selectable low pass/high pass filter with dedicated attack. The cutoff of the filter can be modulated by the attack generator or velocity, both of which are selectable.

IO Singularity costs $14.99 but is currently available for the introductory price of $9.95.