You can get them same effect by adding a control voltage to the waveform
you're using at the CV input of the 700. Imagine you have your switch
set to
occur at the zero crossing of your waveform. As you add a positive voltage
you bias the waveform so that switching occurs more on the negative peaks,
as you subtract voltage, the waveform moves down and switching occurs on
the positive peaks. Sort of "If you can't raise the bridge, lower the river."
Larry first suggested this to me when I was wanting the same mod.
Tomy
norman fay wrote:
>
> This is a module I haven't got yet, though I do mean to get one, as I
> can imagine several uses for it. At the same time, I've been looking at
> the serge "com" (dual comparator) and comparing them feature-wise.
> Though both modules are based around a voltage-controlled switching
> function, both modules produce different results. The MOTM switcher,
> I'm sure you all know about. The serge comparator, OTOH, has two inputs
> marked + and -, a threshold knob and a single output per channel. what
> they do is this: one runs a different voltage/signal into each channel.
> If the + signal is greater than the - signal, the output goes high (+5v)
> if not, it goes low (0v) Using the threshold control, one can either
> generate square waves/pulses from a single input, or raise or lower the
> + signal (I think....). I've been racking my brains trying to come up
> with a way for the motm700 to do this. The voltage bit is easy - set
> the mode to voltage, and feed it with +5v into one input and 0v into the
> other (you could use l. hendry's octave switcher to generate the 5v)
> however, the dual cv inputs are a problem....the only way to do it would
> be to add another cv input to each half of the module, which would
> interact with the "switch" knob. In this case then, if the
> signal/voltage at "cv in" is greater than that at our new input, the
> module would switch one way, if it were lower, it would switch the other
> way. In this case, the "switch" knob could add or subtract from the
> voltage present at the new input, thus acting as a threshold control.
> Now, I'm absolutely ∗sure∗ that there are folks on this list who could
> perform this mod!
> Now, the question you'll be asking is this: why? Well, here's a few
> possibilities:
>
> 1/ from the MOTM700 page at www.synthtech.com:
> "audio demo - chopped up audio switching between 2 waveforms with the cv
> as a 250 hz triangle. you can hear the timbre shift as we manually move
> the SWITCH control"
> with this extra cv in, you could control this timbre shift with an
> envelope or an lfo.
>
> 2/ with a sequencer - clock the sequencer with a narrow pulse wave lfo
> signal, also run pulse wave into MOTM lag processor (fastest attack,
> slower decay) run lag proc out into CV in of MOTM700, run cv source (eg
> lfo or second row of sequencer knobs) into new switch CV input. 5v into
> one i/o socket, 0v into other - result = VC gate time!
>
> 3/ vco triangle wave into cv input, lfo or adsr into new input, +5v into
> one i/o socket, 0v or -5v into other - result = second (or third, using
> both sections of motm700) pwm wave from single VCO!
>
> pretty cool, eh? Any thoughts? Anyone fancy getting to work on this?
>
> please!
>
> best wishes
> --
> norman fay
>