Emax

Yeah, this is what someone told me in the group a few years ago when I was trying to use an mc-4 with the pedal input and it wouldn't track right.  The replies to my question pretty much echoed everything that's been said so I just left it alone.  I did figure out I could "make a pedal" with a pot in case I wanted to turn something up while tracking and not have to use the mod wheel (or be able to do both), but it wasn't that useful and not something I would do more maybe once per year.

Sorry to derail the original guy's post.  


________________________________
 From: jammie <jammie.emma@...>
To: emax@yahoogroups.com 
Sent: Friday, March 2, 2012 12:31 PM
Subject: Re: [emax] Re: Emax pedal input and control voltages
 

  
i thought that it was when using a pedal

if using another device to send cv into the pedal cv then you are asking for 
trouble its not that kind of cv

the cv from another device say modular synth will be ground and the cv 
voltage 0-10v

you will damage the cv circuit

if you want foot control from external device then just use midi

----- Original Message ----- 
From: "Ted Summers" <djtbs1@...>
To: <emax@yahoogroups.com>
Sent: Friday, March 02, 2012 4:54 PM
Subject: Re: [emax] Re: Emax pedal input and control voltages

> If I understand what was said, it was attempted to connect a different,
> external device (not a pedal) to send a control voltage onto one of the
> connections of the emax pedal input.
> If I am wrong in what my understanding is, then ignore this post....
>
> Well, this is quite simply, an electronics question.
>
> The Voltage is coming out of 1 contact, and is used as the reference by 
> the
> IC.
> As the wiper (pedal) is moved, it affects the return voltage in reference
> to the original voltage signal and (depending on the circuit) the
> difference to ground as well.
>
> To inject a signal from some other device I wouldn't expect that to
> necessarily work properly.
> There is no guarantee that the other device's reference ground plane is 
> the
> same.
> That scenario can create a difference in ground potential, a ground loop
> hum can result, bad value can result, etc.
>
> Is the other device using the same pin / connections for the ground and
> reference?
>
> If not, there is potential for damage of both units as well, since you
> could cause a short or overvoltage condition, exceeding the max voltage
> limits of the ICs...
>
> Just something to think about...
>
> Ted
>
>
>
>
>
>
>
> On Fri, Mar 2, 2012 at 8:30 AM, Chase Smith <plus_321@...> wrote:
>
>> **
>>
>>
>> My understanding is that the emax sends a cv out of the pedal input maybe
>> on the ring of a trs jack and that with the ground goes to the inputs on 
>> a
>> pot and the wiper output goes back in on the tip.  I think it expects you
>> to plug in a different type of pedal, than something that would just send 
>> a
>> cv.
>>
>> I've asked about this here before because I had a problem (this is with 
>> an
>> emax II) trying to run the pedal input from a cv sequencer.
>>
>> Can anyone clarify this?  I'll try to look up my old post later, but now
>> this has me curious about it.  I do remember making a "pedal" with a pot 
>> so
>> I could just turn a parameter in realtime so I know that part is true.
>>
>> ________________________________
>> From: zrennaya <zrennaya@...>
>> To: emax@yahoogroups.com
>> Sent: Friday, March 2, 2012 7:52 AM
>> Subject: [emax] Re: Emax pedal input and control voltages
>>
>>
>>
>>
>> Thanks jammie..again!
>>
>> So if I got you correctly, that particular ssm2300 has several channels
>> (I'm guessing 8), emax uses one for each of the onboard CV sources and if
>> they all work correctly it's only the pedal input channel that's messed 
>> up
>> and it splits its signal to the same output as the data slider for 
>> example,
>> plus the sampling itself is also messed up on that specific channel?
>>
>> And sample and hold in this case means it's a basic AD converter and on
>> the analog processing end there's a same basic DA one, right? I mean, the
>> onboard controls are pretty smooth considering that but do you think 
>> their
>> resolution is good enough for me to use an already D->A controller and go
>> A->D->A with them again? I'm talking about a higher-rate saw LFO.
>>
>> Thanks!
>>
>> --- In emax@yahoogroups.com, "jammie" <jammie.emma@...> wrote:
>> >
>> > ssm octal sample and hold ic is damaged
>> >
>> > ssm2300 exchange for a smp08 by analog devices its a pin for pin
>> replacement and has a better slew rate
>> >
>> > the pitch wheel the modulation wheel the volume slider and data slider
>> are cv sources the ssm2300 samples these and send the digital data to the
>> cpu which then processes the info and sends it to the smm2300 that out 
>> puts
>> the digital control data to a cv analog output for controlling the filter
>> or vca or panning
>> >
>> > you need to check the manual as i dont have it in front of me but 
>> > therte
>> are several ssm2300 octal sample and hold multiplexer ic
>> >
>> > you need to check the manual for the 1 that samples the voltages from
>> the controllers
>> > ----- Original Message -----
>> > From: zrennaya
>> > To: emax@yahoogroups.com
>> > Sent: Friday, March 02, 2012 11:48 AM
>> > Subject: [emax] Emax pedal input and control voltages
>> >
>> >
>> >
>> >
>> > Hi everybody!
>> >
>> > I have another issue with my Emax, I've tried to use a CV signal to
>> alter the filter cutoff -since there's only a sinewave internal LFO. The
>> manual says the pedal input receives standard CV signals but here's what 
>> it
>> does for me: even if the pedal input is not assigned to anything in 
>> preset
>> definition, when I send a CV signal, the display jumps around different
>> submenus, on the main page it jumps around presets and when the cursor is
>> on some parameter to adjust, it changes the values, so basically it does
>> the same job as the DATA slider.
>> >
>> > The other thing is, this is a MIDI controllable CV source, so MIDI CC
>> values 0->127 means -5V -> +5V control voltage and even if I try to
>> recalibrate the pedal input, when the cursor is over a parameter value,
>> when I turn the MIDI knob, there's no increment between cc values 0-51,
>> then some weird increment jumps between 52-59, then no increment between
>> 60-124, then major jump between 124-127.
>> > Consequently, when I assign the pedal input to the filter fc, the 
>> > cutoff
>> frequency is jumping around in the same fashion, while the submenus jump
>> around on the display at the same time.
>> > Could anyone please give me some advice, or knows wether I'm doing
>> something wrong or it's the emax's fault? Thanks a milion!!
>> >
>> >
>> >
>> >
>> >
>> > [Non-text portions of this message have been removed]
>> >
>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Emax and Emax II User's Group Website
>
> http://www.silveriafamily.comYahoo! Groups Links
>
>
>


 

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