[sdiy] Simple MIDI-syncable LFO...?

[john mahoney]

> Yes John, a simple 180 degree inversion of phase of an LFO is quite
trivial
> indeed (one opamp and two resistors), but that only works with
analog LFO
> signals.  Unfortunately, the LFO's in the Electrix "MO-FX" effect
unit that Blandon
> mentioned are software-generated LFO's, and these soft LFO signals
don't even
> get turned into analog voltages before being routed to "real" VCA's
and
> filters, etc..    The MO-FX doesn't have any VCA's or filters,
etc. -- it just has
> a DSP chip.  It's all done in the virtual realm -- both the creation
of the
> LFO wave, and all the signal modulation that it controls.
Therefore, the only
> way to invert that LFO output would be to disassemble,
reverse-engineer,
> rewrite, and reassemble the FO-FX's internal firmware code.

Maybe a MIDI delay would be useful in this instance:
    http://www.midisolutions.com/proddel.htm
Expensive, though! Cheaper to go analog.


>  Of course, this should
> be child's play for richard at skydancer.com, since he's so well
convinced that
> software LFO's are so much easier and better than hardware LFO's.
For the
> other 99% of us, however...

In all fairness, Richard is talking about a DIY project. :-) As more
of a software guy myself, I'm interested in that approach, too -- but
I haven't gotten into the microcontroller stuff... yet.
--
john