Strange bug with Tartarus Pro and Synapse 4 | Razer Insider
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Strange bug with Tartarus Pro and Synapse 4

  • May 27, 2025
  • 8 replies
  • 380 views
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Just built a new PC with a fresh Windows 11 install, and decided to try Synapse 4 (previously used 3). I’m seeing some odd behavior with my profile in Synapse 4 that works OK in Synapse 3. I’ve duplicated the problem on a brand new profile to rule out import issues, and duplicated it with a spare (older) Tartarus Pro that I have.

I’m curious if anyone can duplicate this, or if I should start looking elsewhere for the problem.

On a fresh profile, these keys in particular demonstrate the issue.

I’ve set:

  • 07 to keyboard alphanumeric 7
  • 16 to keyboard modifier ALT
  • 17 to keyboard alphanumeric 7 with CTRL modifier (CTRL+7)

When I hold the 16 key and press 07, I expect the output to be ALT+7, but it appears to send BOTH the 07 and 17 keys in parallel, resulting in overlapping outputs. Sometimes ALT+7 comes out first, but it’s usually CTRL+ALT+7.

This doesn’t seem to affect the other keys, i.e. I can have 08 and 18 set up similarly and they work fine.

 

For now I’ve switched back to Synapse 3, which doesn’t exhibit this behavior. Can anyone reproduce this in Synapse 4?

A
Shedoa
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8 Replies

TanTIGERSEYEquick656

I have the exact same issue - Pressing 16 as CTRL and 7 as 1, it activates 7 AND 17 at the same time. Doesn’t happen if I hit the correlating combination via keyboard.

I was going insane trying to figure out what was happening, as it kept hitting specific keybinds in an MMO. Haven’t found a solution yet.

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Shedoa
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Shedoa
  • Shedoa
  • Insider Mini
  • July 11, 2025

Same issue here.  07 is bound to 1 on mine. Holding shift will type both ! and A. I can’t figure out why A because default bind is Q. Neither turbo or modifier is active. When looking at the keybind editor on 07 its the only key that will show a check box under turbo for modifier. Even though it shows unchecked it seems to be applying something without a modifier even being present. if you create profiles to Keymap 3 that box is gone but does not fix the issue. 

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V
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  • Voodoll
  • Insider Mini
  • July 19, 2025

Similar for me, when I press 09 and 20, it activates 10….

 

What the hell is going on and how to fix this??

D

Same issue here, this is preventing me from upgrading from synapse 3 to 4

M
  • MorussGrunt
  • Insider Mini
  • September 1, 2025

I have the same problem. Pressing 16 + 07 doubles output for 17. This issue appears on synapse 4, but not with (old) synapse 3. 🙄
Haven’t found solution yet. 

VioletRedbicycleauto166

This exact same thing was happening to me, and I thought I was going crazy or that I was somehow fat-fingering my buttons. I’m also on a Tartarus Pro and just recently upgraded to Synapse 4. I didn’t have this problem before upgrading, as far as I could tell. I’m playing an MMO, and I have 16 mapped to “Ctrl”, which is the key I use to switch between hotbars. 07 is mapped to “4” and 17 is mapped to “0.” When I press 16 and 07 to activate Ctrl+4, it also activates Ctrl+0, which means two abilities are trying to go off in-game simultaneously! 

 

HERE IS WHAT I DID THAT “FIXED” IT:

After some baffling testing, I changed the Actuation on key 17 on the Tartarus from 1.5mm to 1.6mm, and it appears to be working normally now! No other changes were required. Should I have exploit a loophole like this to get my controller to work properly? No, of course not. But all I wanted was to go back to playing my game in peace, and now I can do that, so I am sharing this here, in case this helps someone else in a situation like mine!

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  • RoboKrikit
  • Author
  • Insider Mini
  • November 2, 2025

Synapse 3 will be End of Life on February 3, 2026.

If Razer discontinues Synapse 3 with this bug unfixed, I will be discontinuing Razer devices from my household.

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  • Spookykid
  • Insider Mini
  • November 17, 2025

This exact same thing was happening to me, and I thought I was going crazy or that I was somehow fat-fingering my buttons. I’m also on a Tartarus Pro and just recently upgraded to Synapse 4. I didn’t have this problem before upgrading, as far as I could tell. I’m playing an MMO, and I have 16 mapped to “Ctrl”, which is the key I use to switch between hotbars. 07 is mapped to “4” and 17 is mapped to “0.” When I press 16 and 07 to activate Ctrl+4, it also activates Ctrl+0, which means two abilities are trying to go off in-game simultaneously! 

 

HERE IS WHAT I DID THAT “FIXED” IT:

After some baffling testing, I changed the Actuation on key 17 on the Tartarus from 1.5mm to 1.6mm, and it appears to be working normally now! No other changes were required. Should I have exploit a loophole like this to get my controller to work properly? No, of course not. But all I wanted was to go back to playing my game in peace, and now I can do that, so I am sharing this here, in case this helps someone else in a situation like mine!

Thank you, you are a life saver I was getting so mad at this. I also couldn’t bind anything initially I had to unplug my device and use this device cleanup utility to remove all the drivers for my USB devices and then restart my PC and then run synapse and then plug my device in again to get it to work, but then I ran into this issue and it was driving me insane, I would crouch everytime I sprinted and hit 1 because I have 07 as 1 key 16 as shift key and 17 as C for toggle crouch lol.

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