opinions needed

[J.G. Wong]

You are on to something Michael.  If you pull it up to patch points or a
modeswitching  matrix it could be hugely useful and open to many
interface designs.   A bandpass pot matrix, joystick. integrated into a
voltage processor. Ever seen an EML 301 We are getting into Wiard territiory.

g wong

WeAreAs1 at aol.com wrote:
> 
> Gino Wong <adaaxs at erols.com> wrote:
> 
> << One idea that I have been
> thinking of is that of the EML synths, which are nice but lab equipment.
>  They have an LP / BP /  HP module that is implemented on one sweeping
> mode pot.  Pan right through three modes. >>
> 
> Yes, that's one the coolest features of the EML101.  The way that filter mode
> pot is implemented is quite different from the filter mode pot on the
> Oberheim SEM.  The EML pot is a linear pot that has a center tap.   The
> outputs of the three filter responses are attached to the center tap
> (bandpass) and the two endpoints of the pot (lowpass and highpass).  The
> wiper can then just directly pan between these three filter outputs.  This
> gives the mode pot a more dramatic effect than the sound you get when you
> sweep the mode pot on the SEM.
> 
> It would also allow you to change the order or position of the three
> responses, relative to the pot knob.  That is to say, if you rewired the
> three taps, instead of having it sweep from Lowpass to Bandpass to Highpass,
> you could have it sweep from Lowpass to Highpass to Bandpass, or even to the
> output of a completely different fiter.  (I guess you install some patch
> points to acheive this, if you found it useful)
> 
> The real trick, for us DIY'ers, is finding a source for rotary pots that have
> a center tap.   Does anybody out there have any sources for these?  I'd sure
> like to get some.  Center tapped pots with a center detent would also be very
> useful, especially for things like CV attenuators with both positive and
> negative CV outputs.  Having a grounded center point with a detent would
> ensure that it would always be easy to find the "off" point in the attenuator
> knob's travel.
> 
> Michael Bacich