KVRDC12: Full Bucket's Frequency Shifter

We are now in the download and voting stage of the KVR Developer Challenge 2012. This news item features an entry called Frequency Shifter by Full Bucket Music. You can download it for free here.

Here's what they say about it:

The Frequency Shifter is a VST 2.4 software effect for Microsoft Windows written in native C++ code. The main features are:

• Frequency shifting up to ±5000 Hz.
• Optional LFO with five waveforms.
• Four frequency ranges, three mix modes.
• Linked or individual control for both stereo channels.
• Plug-in comes in 32 bit and 64 bit versions.
• Fully compatible with SM Pro Audio's V-Machine.

The Frequency Shifter shifts the spectrum of the input signal up or down along the frequency axis. This effect is also know as "Bode Frequency Shifting" or "Single Sideband Modulation"; IMHO one of the most underrated and ignored effects ever.

Do not confuse the Frequency Shifter with a pitch shifter. A pitch shifter multiplies all frequencies of the input signal by a constant factor while a frequency shifter adds (or subtracts) a constant amount of Hertz to (or from) those frequencies. Thus, the harmonic structure of the input signal will not be preserved in the modulated signal, resulting in a raw, inharmonic, metallic, you-name-it sound the more you apply the effect. Even more, if you mix a slightly shifted signal with the original input signal you will get some uncommon phasing sound.