Emax

Hi, 

Most CV pedal inputs on keyboards expect a foot controller that works like a 
potentiometer. The potentiometer supplies no voltage itself, instead it just 
acts as a divider for a reference voltage supplied by the keyboard. The 
keyboard's jack will have a tip, ring, sleeve connections which are for the 
reference voltage output, the wiper return and the ground. The reference 
voltage and the ground are connected at either end of the potentiometer and 
the wiper returns some in-between voltage depending on the position the 
pedal is adjusted to. But the maximum wiper voltage range will always be 
somewhere between reference and ground. You should not generally connect 
voltages outside this range or you may cause malfunctions or damage to the 
wiper input circuit. 

When plugging an external voltage into the pedal input you also need to make 
sure you are inputing the voltage only between the wiper terminal and 
ground. If you connect your input to the reference voltage, or short the 
reference voltage to the wiper or ground, then you could see all sorts of 
problems. I suggest putting a tip-ring-sleeve plug in the CV input and 
measuring the voltages on the three terminals with a multimeter. Then make 
sure you do not exceed the reference voltage you measure coming out on one 
of the terminals. 

Good luck with it, 

Tristan
 

Chase Smith writes: 

> Hello,
>     I am trying to figure out a way to get control over the modulation destinations from the foot pedal in with my MC-4.  I thought it would be a simple plug and go operation, but there seems to be something that I am missing.  When I tried it with a range of values, the emax (II) just seemed to go crazy.  It was modifying the filter cutoff, but it seems that sending CV above a certain value (relatively low) begins to affect the pitch in an odd manner (although it is not set up to, unless it is a global, default setting that I don't know about).   
> 
> I get the same kind of problem when I try to use my MC-4 on my E4k foot pedal in.  Is what I am trying to do possible (Use the mc-4 as a foot pedal and the MUX outs as foot switches)?  Anyone done this before or something similar? 
> 
> I know that there is nothing wrong with the MC-4, but I'm thinking that it is sending too much voltage or something.  The MC-4 sends 0-10.42V for CV and 12V for gate/MUX, but I have no idea what "standard" foot pedals and switches send. 
> 
> Thanks. 
> 
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