LFO questions...

[J.D. McEachin]

At 08:43 PM 11/4/96 -0600, DJMaytag wrote:

>1) has there every been an LFO with a sync input, like you would have on an
>osc to sync 2 osc's together? it may be dumb, but i thought it might be
>interesting to have an LFO reset every now and then, maybe by another slow LFO

Yes.  I believe you can do this w/ the Xpander/M12, for all manner of insanity.


>2) is there any way to get multiple LFO's to sync up at the same speed?

I'm guessing you want them to have different phases, yes?  Otherwise, what's
the point?  Seems that you could use a single LFO and multiple phase
shifters.  Somewhere in ElectroNotes is a quadrature oscillator (4 LFOs at
90degree shifts), which was popular in the days of quad (speaking of quad, I
remember in high school someone brought in a quad record player w/, I
believe, "Wish You Were Here".  For some reason the demonstration was w/ the
lights off.  I got to class late, and tripped over the power cord!  Oopsies.
People were pissed, though I thought it made a cool sound).  Er, anyway, I
think Shepard Function generators (infinite barberpole pitch generators)
tend to do the same thing.  Of course, these two examples use fixed phase
relationships, and I think variable would be more fun.  You could probably
take the circuit out of something like a Mutron and adapt it, using a pot to
vary the phase instead of an LFO.


>3) is there any way to get multiple LFO's to sync up at MULTIPLES of one
>LFO's speed (i.e. one LFO at .1 Hz, another at say, .2 Hz, and a third at .8
>Hz)??

Use a master LFO and several frequency doublers (they work on zero
crossings), then waveshaping.


>gosh, i wish i had an EE degree so i could build all the ideas i have
>floating around in this head of mine... :(

I wish I had 40 hour days so I had time to build all the ideas I have
floating around in this head of mine...

JDM