Emax

--- In emax@yahoogroups.com, Brooks Mosher <brooksmosher@...> wrote:
>
> Jammie, can you explain more about the smpo8?

  right there are 4 2300 sample and hold multiplexers they have 8  
  channels 1 for each voice of polyphony 1 2300 deals with the filter
  cut off envelope 1 2300 deals with the vca envelope 
  1 2300 deals with the resonance setting 
  and the last deals with the panning control 

  a digital signal is sent to the sample and hold via binary this
tells the 2300 which channel and what voltage it needs to be this
voltage is then held and sent to the filter or function that it
performs the digital signal is changed to analog voltage and is
scanned and held at intervals this is micro processor controlled  and 
 is 0-5v .

 the smp08 is a new ic made by analog devices and is pin for pin
compatible its slew rate is a lot faster than the 2300 and is less
power hungry 

now because the sample and holds deal with the voices it could be that
some of the channels are not sending the right voltage it could be
sending 0v instead of 2v or what ever voltage it is supposed to be

 now 0v on the filter envelope would give your filter 0 cutoff you
would get no audible sound 

 if it was the vca envelope it would be the same ov would give you 
 no volume

 the resonance setting 0v means no resonance 

 the pan function uses 0v would give you full pan left

 this would be for the stereo outs

 now have you checked the separate outs 

 jamie
> 
> thanks,
> 
> Brooks
> 
> On Mon, Feb 2, 2009 at 8:03 PM, jammie.emma <jammie.emma@...>wrote:
> 
> >   --- In emax@yahoogroups.com <emax%40yahoogroups.com>, Brooks Mosher
> > <brooksmosher@> wrote:
> > > this could be a number of things you could have a filter amp ic down
> > or the sample and hold chip is playing up these are 2300 ic
> >
> > if it is these upgrade to smpo8 as these are the replacement and
> > have a faster slew rate equals snappier envelopes.
> >
> > or it could be the e chip if its this then you cant get these no
> > more unless you get a broken emax1
> >
> > also check the decoupling caps if these go down you can get all
> > sorts of problems from distortion to audio drop outs
> >
> > you will need a oscilloscope to see this though.
> >
> > jammie
> >
> > > Maybe someone on the list can help me here.
> > >
> > > So I got a new floppy drive working (thanks Ted) on my Emax and I'm
> > *just*
> > > now getting around to using EMXP and loading up presets. It's a
> > Teac Slim
> > > Floppy and looks pretty slick in the rack as it matches somewhat
> > closely the
> > > color of the Emax Chassis. I've got room for another 3.5" drive
and was
> > > going to put a Zip100 in only to find out that they are a
fraction wider
> > > than the slot I have to work with. Ugh. (anyone else run into
problems
> > > mounting a Zip100 drive per it's width?).
> > >
> > > Anyways, my question that is bothering me at the moment::
> > >
> > > Is it possible that a few of the voices could go out on these? I
> > seem to
> > > have limited polyphony on mine (although I haven't confirmed this
> > 100% as
> > > I'm not using my own presets and there could be layered samples).
> > Anyways I
> > > checked and none of the voices are disabled in the Master
section, and
> > > nothing distorts... it just seems like I'm not getting 8 note
> > polyphony.
> > > Any insight from the group? I definitely need to test this for sure
> > with a
> > > preset that uses 1 sample only mono.
> > >
> > > Thanks and much respect to the people on this forum,
> > >
> > > Brooks
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >  
> >
> 
> 
> [Non-text portions of this message have been removed]
>