Get a triple pedal from 3 ordinary pedals

[Mr_-G-]

The right pedal uses 2 velocity switches. You need 4 contacts to emulate everything it can do (half pedal, full pedal AND velocity for the pedal noise).

[Dugenou]

Hi folks,
Do not know if this topic is still alive, but I think I've got the good solution to this problem.
To start you need to get three of any N.O. switch pedal. (I don't know if I can write witch model I use here)
Just connect the una corda and latch pedal like the first schematic, Common side to the shield and una corda switch to the ring across a 5.6k resistor, and latch switch to the ring across a 10 k resistor.
The sustain pedal is sampled to check its velocity, and the sofware seems to not like a too quick transient signal, randomizing the result.
the simple way is to connect a 100 uF capacitor between the tip ans the shield, and connect the sustain pedal switch between the tip and the shield across a 1 k resistor. This way the software get enough time to make some different samples and compute a dummy velocity.
Of course, a single switch pedal can't emulate true velocity, but the sustain works well.
This has been tested successfuly on a nord stage 3 88.

[Mr_-G-]

Hi Dugenou, good thinking! Would it be too much trouble to update the diagram and post it here?

[Dugenou]

Well, here's the complete diagram.
The capacitor value sould be change to a smaller one, maybe down to 33 ou 22 uF to reduce pedal latency, too small should avoid good keybord sampling.
The 1k resistor seems to be the good value as the sustain threshold is about one tenth of the pedal supply (3V dc across 10k) so about 300 mV.

[Dugenou]

The keyboard system must be set to TRIPLE. The Jack connector is a simple stereo one.

[Dugenou]

I've tried it with a 10 uF tantalum, it works fine without noticeable latency.

[Dugenou]

Nice idea using a capacitor to emulate the resistance transition @Dugenou, if you want to emulate the real Triple Pedal the resistor value when pedal is fully pressed should be a little lower (if you look at the Triple Pedal schematic picture
I made for this discussion accessories-and-amplification-f8/inside ... 83-40.html you can see that it should be 820//2.2K//4.7K//10K Ohms, so basically something close to 620 Ohm, to stay with commercially available resistor values, otherwise you may use a 1K trimmer)

PS: with 1K and 10uF you are setting a "cutoff frequency" (of pedal status changes) of circa 15Hz, with 620 Ohms it will raise to circa 25Hz

[Dugenou]

Hi maxpiano,
Thanks for reply, you're right the good resistor value is about 620 Ohms, I first choose 1k because I had nothing else than my keyboard to check and no triple scheme.

Here's the job I made, I think 10µF is a good value ant make a time constant very lower than the quickest foot .

I'd like to make another job, now, perhaps could you help me.

I'd like to build a rotor double switch to achieve STOP/START and SLOW/FAST function, a little like Clavia halfmoon switch, but this seems to not work on my Stage 3.

[Bjosko]

Which model 3 ? The 3-Way switch are only working on the Compact. On the HP and 88 only between slow and fast.

[Dugenou]

Hi Bjosko, thanks for answer. I have a Nord Stage 3 HA88 and I'm looking for an alternate way to activate/unactivate rotary with a foot switch. I already use a pedal switch to toggle slow/fast.