The G1 and G3 buttons (G-keys) on the G635 gaming headset are pre-programmed to cycle through equalizer profiles and lighting effects.
You can use the G1 button to cycle through the lighting effects and G3 to cycle through equalizer profiles.
Cycling behavior is different depending on whether or not the headset is connected to a PC with Logitech G HUB installed.
Connection to a PC with G HUB
When the G635 gaming headset is connected to a PC with Logitech G HUB installed and running, the lighting effects and equalizer profiles that have been programmed into G HUB are used when you press the G1 or G3 buttons. 
Connection to all other compatible devices
When the G635 gaming headset is connected using the USB cable to a PC that does not have G HUB installed, or is connected to another compatible device, the equalizer profiles and lighting effects stored in the headset's onboard memory are used when you press the G1 or G3 buttons.
Important Notice: The Firmware Update Tool is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Logitech Preference Manager is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Logitech Control Center is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Logitech Connection Utility is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Unifying Software is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The SetPoint software is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
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