While I'm thinking about it, I need somewhere to read and understand LFO - I'm lost in some of the conversation here. If I'm not mistaken, it stands for Low Frequency Oscillation, but Taylor made me think I need to understand it better, cause I'm planning on mounting a Phase, Trem and Flanger all in one DD box, and he said something about making their LFO's match and I thought to myself, "I don't know what that means, but sure - especially if it's good for my sound.
According to my best understanding, a Low Frequency Oscillator is used in modulation effects to create a sweep. For example, a tremolo modulates volume from loud to soft. If you imagine a square wave, in terms of a tremolo, when the wave is high (or on, or however it would be described), the volume put out by the tremolo would be as loud as it goes. When the wave is low (or off, however it would be described), the volume put out by the tremolo would be as quiet as it gets. The LFO oscillates between high and low.
In other effects, like a phaser, the LFO modulates the phase shift. In regard to a delay, LFO modulation usually describes a slight raising or lowering of the pitch of the repeats, usually by slightly raising and then lowering of the delay time, which causes the repeats to sound, um, more spacial and, I suppose, liquidy-- kind of chorus-like.
You can use many shapes. Square waves, which are on-off, sine waves, which smoothly ramp up and back down again, "ramp up," which slowly ramps up and then quickly cuts off, "ramp-down," which quickly ramps up and the slowly cuts off, etc. Maybe this graphic
will help you visualize it a bit.
Syncing LFOs could open up a whole bunch of interesting combinations-- like a phaser whose sweep is in sync with the repeats of a delay, or a tremolo whose volume changes are in sync with the repeats of a delay. You could even us a ratio, so, for example, the sweep of a phaser could be twice as fast as the repeats of the delay, but still proportional. There are many possibilities.
Shifting gears, I emailed Tom from ElectricDruid to see if he's made any progress on his tap tempo VCLFO. I'll post here if I hear back.