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

[WeAreAs1 at aol.com]

In a message dated 10/18/04 8:49:10 AM, jmahoney at gate.net writes:

<< Ah, but inverting the LFO's output is simple, and it sounds like

that's all you want to do. Complete control over an LFO's phase is a

completely different matter. >>

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.  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...

Michael Bacich