Home › Forums › Help/Technical Questions › Tube EQ expression input

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  • October 30, 2009 at 10:01 am #79221
    larsipan
    Member

    Not a guitarist (woodwinds, wind controlled synths), I can see future use for different EH pedals together with modular synths. Judging from sound clips the Tube EQ seems a good choice for a filter creatimg overdriven ringing effects as well as a wha pedal.
    How does the expression pedal input respond to 0-5 volts, is it the analog modular synth’s 1v/oct or Hz/v characteristics?

    October 31, 2009 at 11:10 pm #103081
    larsipan
    Member

    Being a Forum newbie I expected a comment from a company tech, but maybe the Forum doesn’t work that way. Also I’m colored by my analog synth background. After all, this is a guitar player list. OK let me do it this way then.
    Would somebody with a Tube EQ, a voltage source such as an expression pedal, and a voltmeter please do the following. First, put the meter in parallel with the pedal, meter + to pedal +, same with grounds. Position the pedal at its low voltage end. Then with the bass and treble shelving filters disabled raise the the bandpass Q until self-oscillation occurs. With the help of a piano, guitar, etc, fine tune the pedal to a chromatic pitch. Read the meter voltage. With the pedal raise the pitch one octave. Again read the voltage and calculate the increase in volts. Repeat this process twice or more.
    Does the the meter show the same increases for each higher octave or is there any other recognizable pattern?

    November 1, 2009 at 5:12 pm #103103
    electro-melx
    Moderator
    Quote:
    Being a Forum newbie I expected a comment from a company tech, but maybe the Forum doesn’t work that way. Also I’m colored by my analog synth background. After all, this is a guitar player list. OK let me do it this way then.
    Would somebody with a Tube EQ, a voltage source such as an expression pedal, and a voltmeter please do the following. First, put the meter in parallel with the pedal, meter + to pedal +, same with grounds. Position the pedal at its low voltage end. Then with the bass and treble shelving filters disabled raise the the bandpass Q until self-oscillation occurs. With the help of a piano, guitar, etc, fine tune the pedal to a chromatic pitch. Read the meter voltage. With the pedal raise the pitch one octave. Again read the voltage and calculate the increase in volts. Repeat this process twice or more.
    Does the the meter show the same increases for each higher octave or is there any other recognizable pattern?

    Hi welcome to the forum, EHX employees do visit here but not very often….you’d probably be better contacting ehx direct if you wanted to speak to a ‘tech’ … the forum is almost entirely made up of regular EHX users (admin included) who will always try to help each other, but obviously even though we are ‘fans’ of ehx equipment we don’t own everything they make….with pedals like the tube EQ you might find that not many of us own them and a helpful reply my take a little longer coming.

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