I play with both a Tyros and a Korg Triton. They both use stereo Volume pedals. I would like to use a single pedal with a Y-Jack to control both of them. Anyone have any luck hooking up this kind of volume pedal?

Al

It will work fine..If you are referring to audio and not midi[controll 7 or 11].

[This message has been edited by Fran Carango (edited 07-16-2003).]

I wouldn't do it for two reasons. First, both keyboards do not use the same voltage power supply--one is 12 volts and the other, if I racall, runs on either 16 or 18 volts. That could cause a problem, depending on where in the output circuit the volume control is used.

The second is you may have an impedience mismatch, again, depending on where in the circuitry the volume is regulated. One may be on the output, while the other may be in the pre-amp section. Not a good idea to hook them together.

The best way to accomplish this safely is to physically attach a pair of foot volume controls together so when you depress one, the other also is depressed at the same time. Essentially, they would be side by side, the bases glued together and the pedals attached together by means of a lightweight bar or screws.

Good Luck,

Gary

If it's a passive pedal, there shouldn't be any risk, right? That just sounds like needless worry...voltages and such. It's an audio connection that is paired with another audio connection. Should be the same as plugging two instuments into two jacks in an amp. We did that for YEARS.
I'm no electriction, but I would not worry about doing that hookup.

The best way is to use a set of VCA (voltage controlled amplifier) chips which can be tied together and controlled from a single expression pedal resistor. Of course this would need a bit of electronics to be designed. Another option which isn't so daft as it sounds is to use LDR (light dependant resistors).. use the pedal to control a lamps brightness inside a closed box together with a few light dependant CdS resistors for altering the signal levels to each keyboard... You could also try replacing the potentiometer in thepedal with a 4 gang device...?

Simon

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I must be missimg something,, as Dave mentioned, your connections are coming from the output jacks of the keyboards to a passive volume pedal that acts as a "pot", then continues to the amp.. There is no difference then if the keyboards are connected to the amp..All the keyboards have a nominal impedance that amps[and volume pedals] can handle..We are making more out of this then we need too. As Dave said we 've been doing this for years..

Wow, if I have to get out my occiliscope for this project, you can forget it. LOL

I have a Yamaha FC7 which when plugged into my Tyros controls the volume. If I unplug the pedal and plug it into my Triton it controls the volume - Just fine.

What I'm trying to do is find a cable that has a single female stereo jack that splits into two MALE Stereo plugs. I went to Radio Shack and they have a MONO cable for this, but NOT a Stereo. Rather than getting out my soldering iron and some cable, does anyone know if this is available PRE-MADE?

This would save me a ton of space not having to use TWO pedals. I find it hard to believe no-one else playing two keyboards has this issue or that someone has not come out with this out of necessity. hmmmm

Al

Al,

you might find your speacial cable here http://www.hosatech.com/

or you can have one made easily at Gig Cables http://www.gigcables.com/

Guess I must have missed something along the pike. I've never seen a single potentiometer hooked to more than a single device. When two instruments are connected through the same input, the output inpedence of their respective transformers is halved because they become parallel, resistive devices. That's what pre-amps and mixers have separate channels, blocking diodes and lots of other directional components that prevent impedience changes and problems with polarity differences between various types of equipment. Personally, if they were my keyboards, I would go with either a 4-gang pot in the foot-volume control and dual controls physically hooked together.

Good Luck,

Gary

Gary, isn't the master volume on the keyboard amp the same situation as the twin feed into the passive volume pedal?

Gary, I see what your saying. Your thinking the outputs of the keyboards are being routed through the pedal and then from the pedal to the amp.

On the Tyros and the Triton, there is a stereo input specifically for pedals which as far as I know, do not intercept the input/output signal.

Al

The master volume on most amps, keyboard or otherwise, is usually prior to the the output transformer used to drive the speakers, mainly in the primary circuit of the amp's final stages. The input volume controlled through the mixer is most often a small, 20K-ohm pot that dampens the signal, then passes it through the EQ circuit, through the Pan circuit, through a pair of blocking diodes, and finally through the main gain and outputted into the output transformer's primary coils. The secondary coils are what then sends the signal to the speakers--at least that the way my Peavey's, Crates and Polytone amps are wired. I'm not sure about some of the other brands, but I did run across a keyboard several years ago that had a positive ground, which was used in some systems in the early days of keyboards. You couldn't even connect this particular keyboard to an amp that had anything other than a floating ground without blowing a circuit breaker. I rigged a resistance mixer with blocking diodes for the guy and he was able to then plug into most PA's without encountering a problem. The only test to determine the safety of hooking a "Y" connector to a single foot-volume control would be to measure the electrical potential betewen both keyboards using either a voltmeter or an oscilloscope. He could get lucky and everything might be OK, but I would be very cautious about this one.

Gary

This is exactly what I need:

YPP-308 STEREO ¼" PHONE (FEMALE) — TWO STEREO ¼" PHONE (MALES), 6 inches


Thank You, Thank You, Thank You!!!!!!
Regards,
Al

Hmmm,
I was talking a passive easy-in easy-out volume pedal, not a dedicated TRS type pedal that connects to a special jack. You can get a stereo volume pedal (Roland used to make one ... I think they still do)that has 2 ins and 2 outs. They are passive inputs and require no additional worry or connections. Use "Y" cords or sub mixers ... it won't matter. Just plug and play - couldn't be simpler.