Synapse 4 has a lot of bugs that prevent me from using it, so I had to switch back to Synapse 3.

1) I have a Razer Croma Wireless ARGB Controller connected to my computer. In Synapse 3, when the computer was turned off, the controller simply lost connection and returned to the state that I had set through the Croma RGB mobile application - just a static light in the color of my interior. After installing Synapse 4, after turning off the computer, the color changing mode in a circle is turned on on all devices, and on the controller it remains turned on and does not return to the last applied effect from the application.

2) Visualizer mode, which is enabled only for some applications, does not work correctly. In Synapse 3, you can enable it and allow it only for some applications, then it will be strictly activated when these applications are turned on and deactivated when these applications are turned off. This does not work in Synapse 4 - after restarting the computer, even if the application for which Visualizer is enabled is not running, it is still activated and takes over control of the backlight. Turning off the mode when closing this application in Synapse 4 also does not work - even after closing the selected application through the task manager, Visualizer still continues to control the backlight; in Synapse 3 this problem does not exist.

3) When you turn on the PC, an effect may be incorrectly selected from the list of effects from the studio - not the one that was active the last time the computer was turned off. You have to switch it manually, although Synapse 3 always remembered the mode that was active before turning off the computer, and it was restored after the computer was restarted.