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  #1  
Old 02-28-2011, 04:45 PM
boosty boosty is offline
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Default MPA controling stompbox

Hi,
I recently bought a MPA, and my project is to control pedals with the 100k midi pots.
these pedals are: EHX frequency analyzer (freq.), evans MX101 analog delay (feedback and time), and a maestro boomerang wah (freq.).
the EHX frequency analyzer runs on 40V DC, is this a problem ? will it work if i change the original pot by the virtual one (MPA).

in the user manual ican read:
Minimum voltage on potentiometer terminal: 0V
● Maximum voltage on potentiometer terminal: 5V
does that mean that i can't use this pot in circuit that runs on more than 5 V ???

another question, what software do you recomand for sysex progamming ??
i'm running Win XP

thanks !

boost
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  #2  
Old 03-02-2011, 02:41 PM
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John John is offline
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Hi Boosty,

Quote:
Originally Posted by boosty View Post
Hi,
I recently bought a MPA, and my project is to control pedals with the 100k midi pots.
these pedals are: EHX frequency analyzer (freq.), evans MX101 analog delay (feedback and time), and a maestro boomerang wah (freq.).
the EHX frequency analyzer runs on 40V DC, is this a problem ? will it work if i change the original pot by the virtual one (MPA).

in the user manual ican read:
Minimum voltage on potentiometer terminal: 0V
● Maximum voltage on potentiometer terminal: 5V
does that mean that i can't use this pot in circuit that runs on more than 5 V ???
It depends what voltage is connected to the potentiometer itself. In the original circuit, can you measure the voltage across the terminals of the pot?

Quote:
another question, what software do you recomand for sysex progamming ??
i'm running Win XP
Check this thread:

http://forum.highlyliquid.com/showthread.php?t=280

It is written for the MIDI CPU but applies to the MPA as well.

Hope this helps...
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  #3  
Old 03-03-2011, 04:51 PM
boosty boosty is offline
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yes it helps thanks !
another question,
i made some tests with the analog delay...
it works fine with the time pot, but don't work at all with the feedback knob.
any idea why ?
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Old 03-04-2011, 03:05 PM
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John John is offline
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Quote:
Originally Posted by boosty View Post
yes it helps thanks !
another question,
i made some tests with the analog delay...
it works fine with the time pot, but don't work at all with the feedback knob.
any idea why ?
It's really tough to say, without knowing the details of how the circuit works.

Have you verified that the pot resistance is changing as you intend, before wiring it as the feedback knob?

Also, are you completey replacing the feedback knob, or somehow wiring the MPA output in parallel?
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