# Korg Kross 2 88 - keys triggering at random velocities

**URL:** <https://forums.syntaur.com/t/korg-kross-2-88-keys-triggering-at-random-velocities/9328>\
**Category:** Synth Repair\
**Tags:** velocity-issues, korg, kross-2-88\
**Created:** [January 29, 2026, 5:11am UTC](https://forums.syntaur.com/t/korg-kross-2-88-keys-triggering-at-random-velocities/9328 "2026-01-29T05:11:06Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![analoguefan](https://forums.syntaur.com/letter_avatar_proxy/v4/letter/a/a698b9/32.png) [@analoguefan](https://forums.syntaur.com/u/analoguefan)\
**Post date:** [January 29, 2026, 5:11am UTC](https://forums.syntaur.com/t/korg-kross-2-88-keys-triggering-at-random-velocities/9328/1 "2026-01-29T05:11:06Z")

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[Korg] [Kross 2 88] – [keys trigger at random velocities]

> I have a Korg Kross 2 88. For a while now, the Bb4 has been firing at what sounds like full velocity, regardless of how hard the key is played. This happens playing internal sounds and when used as a controller to play external sounds via MIDI. I took the keybed apart to clean the rubber contact strip and contacts on the PCB board. I wasn’t paying attention to the alcohol I was using to do the cleaning. It was 70% isopropyl instead of 91% that I normally use on electronics. I didn’t realize this until after I reassembled to test and discovered things were worse. That Bb was actually slightly better, but now more keys in that same section I cleaned were playing at odd velocities. Some played OK at “mF” but almost not at all at “FF”. Some were behaving like that Bb. I fear I’ve made things worse by using 70% alcohol that’s generally not recommended for cleaning electronics.
> 
> First question: Is this original problem likely a contact PCB issue?
> 
> Second question: Do the current symptoms affecting multiple keys in the same section now point to a contact PCB issue or something else?
> 
> Third question: Should I just replace the PCB and the rubber contact strip for that section?

• Model & revision/OS:  
• Symptoms (what changed, when):  
• Tests already done (voltages, parts replaced):  
• Photos / audio clips:

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**Author:** ![sargfowler](https://forums.syntaur.com/user_avatar/forums.syntaur.com/sargfowler/32/2120_2.png) [@sargfowler](https://forums.syntaur.com/u/sargfowler)\
**Post date:** [January 29, 2026, 8:24am UTC](https://forums.syntaur.com/t/korg-kross-2-88-keys-triggering-at-random-velocities/9328/2 "2026-01-29T08:24:25Z")

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What was the area around the contacts like? 70% should be OK as it will still dry fast.

I thinking there’s some damage to components/tracks around the Bb area.

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**Author:** ![analoguefan](https://forums.syntaur.com/letter_avatar_proxy/v4/letter/a/a698b9/32.png) [@analoguefan](https://forums.syntaur.com/u/analoguefan)\
**Post date:** [January 29, 2026, 9:07pm UTC](https://forums.syntaur.com/t/korg-kross-2-88-keys-triggering-at-random-velocities/9328/3 "2026-01-29T21:07:31Z")

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Well, it all looks fine to me. Don’t know how anything would get damaged around contacts.