Pedal is one of those things you think, it’s one signal, it should just work. How hard can it be?
But for me I the beginning all sorts of crazy things happened. I fiddled around and it just started working fine. Don’t know why, don’t know what I did but I’m grateful it works. I just play on and hope for the best.
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It should simply just work, but now after opening it up and testing it by hand manually on the switch inside, I realize why it “glitches”. It was simply super crappy China quality inside. =(
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If you want a really good set up go for the RPU-3 Roland triple pedal. It is a real pro set up, it never moves, is built to last decades. I have had mine for ten years and it is like new. https://www.dv247.com/en_GB/GBP/Roland-RPU-3-Pedal-Unit-for-Digital-Pianos/art-KEY0003028-000
Having the three pedals together, stops the slipping and sliding. I only wish ther was a four pedal version with an expression pedal too
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Ah yes, the “slipping pedal” is another issue indeed. 
I will consider that one, Roland is a great brand. I have to stop buying these cheaper brand products, they are all bad quality and fails.
All you need is 5-56😅
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5-56? Sorry, I don’t understand the joke.
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Maybe more like when you have corrosion, water, or things are starting to seize - but I suppose it works as a general contact lubricator as well…
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Ah well, I remember now, Fredrik works in a practical job and used to these things. Myself however, is about as handy as a drunk tortoise turned upside down.
When things fail my usual approach is to scream loudly at it with lots of curse words, while beating it a bit so that it may see its wrongdoings! 
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Sorry, thought most Swedes had heard the Swedish version of YMCA. Det går så bra med lite 5-56
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Common problem! There are tons of cheap sustain pedals out there, I’ve had to replace a few. There is a pedal made by nektar that I really like for my synths, but its cheap and breaks often so i just replace them when I need to haha. For my piano keyboard I have a more roland pedals and they never break or malfunction for many years
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Ah, thanks Peter. I will definitely get a Roland (or other famous brand) next time. 
Do you use MIDI Monitor to check the signal? It’s a free, indispensable tool (for Mac) that lists all MIDI messages; you can filter by source, port, channel, message type, etc. it’s fantastic for troubleshooting problems like this.
Also, I can confirm that the Boss FS-5U is an absolute champ. I used one for many years on tour with Cirque du Soleil after getting frustrated with cheap sustain pedals, and the FS-5U was rock solid. I was using it to trigger Ableton, not as an actual sustain pedal, though. It will feel much different than an actual sustain pedal - it’s more like a guitar stomp button, so there’s almost no “travel” compared to a normal sustain. So that might take some getting used to. But the one I used was practically bulletproof.
Hope this helps!
Jim
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Thanks for the suggestion Jim, I will look that up later. But for the long run I will probably just get the Boss switch to use as sustain pedal. To be honest I think I would prefer shorter travel, as I like to time my sustain pedal better anyway.
exactly the Same. . . I still have the StudioLogic KeyBoard and it surely is the generator of strange midi glitches. . . not just on the sustain pedal, but in the volume pedal and when I do automations with its joysticks . . . . . super glitchy… (thats why I got an iCon Platform M+ for automations… and I love it!) still use the main joystick for glide and the second one sometimes for expression…
hey @Mikael have you tried in your Native Instruments keyboard? the pedal circuit is so basic that it is robust in nature, I would invest better on a quality midi keyboard. . . I believe it could very well be the StudioLogic keyboard and its circuitry and voltages…
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Hey @Mikael I forgot… check your outputs with a midi monitor:
Mac OS : https://www.snoize.com/MIDIMonitor/
Then you’ll know the pedal is ok, or the KeyBoard …
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I actually switched the pedal into my Native Instruments keyboard, and the sustain pedal glitch seems gone. So it perhaps was my StudioLogic keyboard that was the issue.
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… my studioLogic likes to give strange glitches too, I hope you got this fixed.
Download that Midi Monitor. . . .It is useful anyway. 
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OK so now my sustain pedal have started glitching (get stuck on “sustain”) again, even when connected to my NI keyboard and in the other polarity mode. NEVER again will I buy a cheap product like this, so frustrating!!!
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I bet you will 
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Hey Mike, I could bet (but I wont 
) that it is not the pedal, or if it is, it may well be something like the cable or a bad plug…
Use the Midi-Meter
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