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Topic: Expression pedal? |
b0b
From:
Cloverdale, CA, USA
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Posted 10 Apr 2017 12:00 pm |
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What's the difference (electronically) between a keyboard player's expression pedal and a steel player's volume pedal? Can a volume pedal be used as an expression pedal, and vice versa?
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John Billings
From:
Ohio, USA
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Posted 10 Apr 2017 1:31 pm
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Never tell a studio engineer it's a volume pedal! Tell him it's an expression pedal, like on a Hammond organ.
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 10 Apr 2017 1:54 pm
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An expression pedal is a single cable pedal used to control the internal volume circuitry in a keyboard.
It normally still has a pot in it, but is wired to one cable with 2 or 3 wires in the cable.
Here is an example...
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Brad Sarno
From:
St. Louis, MO USA
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Posted 10 Apr 2017 2:17 pm
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This schematic is spot on - linear pot, BUT I did talk to the guys at Strymon and they said they like higher pot values for their pedals, I recall them saying maybe 100k to 1M is good for their stuff. My wife has an expression pedal hooked up to her El Capistan to control the feedback. It's simply a modded volume pedal with a linear pot and a 1k resistor and a single TRS jack instead of an IN and OUT jack.
You can take a volume pedal and connect a TRS Y'cable. The audio taper may or may no be a good thing depending on what you're controlling.
That 1k resistor is not critical but is a good idea.
And to kind of answer your question - generally these days, an expression pedal is tied to a circuit that will be reading the changing values on both sides of the wiper and then converting that analog info to digital to tell a processor to do a certain designated function in the digital realm.
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b0b
From:
Cloverdale, CA, USA
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Posted 10 Apr 2017 11:04 pm
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It's linear taper instead of audio, then?
Do they all have pots, or do some use active electronics, light beams, etc.?
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Mike Neer
From:
NJ
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Posted 11 Apr 2017 5:51 am
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The Boss FV500 can function as both a volume pedal or expression pedal. I might use the expression aspect of the pedal to control the value of one of the knobs on a Moogerfooger pedal, for instance, or connected to an EH Ring Modulator, it can serve as a whammy pedal. There are many uses for an expression pedal granted your effects allow that kind of control.
I once turned an Ernie Ball pedal into an expression pedal (CV, control voltage) with some mods. It wasn't great, though.
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 11 Apr 2017 6:47 am
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B0b, there are some that use electronic circuitry rather than a pot. The Electro Harmonix Next Step Expression Pedal is one such example.
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