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2 H9s controlled by 1 expression pedal

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bbarteldt
Joined: Sep 13 2017
Posts: 1

2 H9s controlled by 1 expression pedal

bbarteldt
September 14, 2017 - 08:23 am

Hi folks-- New to the H9. Laying out the mother of all pedalboards. I'm getting an H9 Max & and H9 Core and am considering how to control both separately with a single expression pedal (Mission Engineering Inc SP-H9). I am considering an TRS A/B box to switch between the two H9s. I assume that won't be a problem, please advise if otherwise. Now, the question is: What about an A/B/Y box, such that I could control either H9 or BOTH simultaneously? I am considering an A/B/Y box made by American Loopers (https://reverb.com/item/4201234-2-way-expression-splitter-selector-contr...) but they encourage checking with the pedal's manufacturer to see if it's ok to combine the expression signal patch with a different pedal. Specifically, they state, "This is a simple TRS signal splitter, there is no voltage regulators of any kind. While this A/B/Y box can be used with with expression pedals, it will be up to you to check with the manufacturer of your pedal for the intended use." If anyone out there has experience/knowledge with this, I'd appreciate your input. Thank you.

nickrose's picture
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nickrose
Joined: Jan 17 2008
Posts: 4574
nickrose
September 14, 2017 - 10:36 am

They don't give a schematic, so it's not clear what it actually does.

On an H9, the expression pedal is more TS than TRS, so it may not be suitable.

 

wedelich's picture
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wedelich
Joined: Oct 20 2008
Posts: 409
wedelich
September 14, 2017 - 10:56 am

bbarteldt wrote:

Hi folks-- New to the H9. Laying out the mother of all pedalboards. I'm getting an H9 Max & and H9 Core and am considering how to control both separately with a single expression pedal (Mission Engineering Inc SP-H9). I am considering an TRS A/B box to switch between the two H9s. I assume that won't be a problem, please advise if otherwise. Now, the question is: What about an A/B/Y box, such that I could control either H9 or BOTH simultaneously? I am considering an A/B/Y box made by American Loopers (https://reverb.com/item/4201234-2-way-expression-splitter-selector-contr...) but they encourage checking with the pedal's manufacturer to see if it's ok to combine the expression signal patch with a different pedal. Specifically, they state, "This is a simple TRS signal splitter, there is no voltage regulators of any kind. While this A/B/Y box can be used with with expression pedals, it will be up to you to check with the manufacturer of your pedal for the intended use." If anyone out there has experience/knowledge with this, I'd appreciate your input. Thank you.

You can always just chain the H9s with MIDI and transmit the expression pedal over a MIDI CC.  I do this in my rig, one expression, two H9s, works pretty well.  

camn
Joined: Sep 19 2016
Posts: 432
camn
September 14, 2017 - 10:01 pm

So- I have a SP-H9, and it is totally passive, so it should work... but maybe unpredictably. The EXP pedal is all voltage driven... so doubling the input voltage might throw off the range of the thing, you know? Like.. when you are on Y-mode.... you hit 100% halfway down the pedal? idk.

(side note for nick- that thing runs TRS because it actually includes a switch that will hit the AUX switch function on the h9)

Another thought...Let me experiment right quick- 

 

OK it seems like I can fire up my H9 just fine with my SP unplugged.. and when I plug it in it reads the position the pedal is in. So thats fine.

Possible problem... when I UNPLUG the SP (which I imagine would be like switching) the H9 gets some junk-voltage.. and it had unpredictable effects on the setting. Like.. once it set it to 100%. Once it fired the Aux switch. Once it DIDNT. That would be a dealbreaker for me.

That might be the biggest problem with this plan. Midi would be better... and cheaper!

 

HOWEVER.. if you want a little more flexibility.. and you have a budget .. the DMC-3XL has an expression pedal in.. and would allow youto independently send MIDI EXP values to either or both H9s on a preset by preset basis... not to mention adding 2 aux switches, looper controls...and a whole dual-preset-control scheme.  http://www.disasterareaamps.com/shop/dmc-3xl-gen3

 

But really- just connecting them via MIDI is probably cheapest and best.

echicago
Joined: Jan 8 2017
Posts: 5
echicago
September 15, 2017 - 02:01 pm

You absolutely do not need any kind of ABY. The easiest way would be to plug the mission into the first h9 expression Jack, then run a midi cable from The 1st h9 to the 2nd.
But if you're building the mother of all pedalboards I assume there's some kind of controller, that probably will have an expression in jack that with then allow you to send expression to any midi capable pedal in the midi the chain, The only thing you have to look out for if you use it that way is that they all want a TRS cable, some do not.