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?