Logitech G413, G512, G513

General

Volume down

`Fn` + `Scroll Lock`

All hotkeys for Logitech G413, G512, G513

General Toggle game mode. Game Mode LED on keyboard will light up when the mode is active.	`Fn` + `F8`
General Backlighting: Cycle between five brightness levels	`Fn` + `F7`
General (G513 only) Cycle between 7 onboard lighting effects	`Fn` + `F5`
General (G513 only) Load stored lighting layout	`Fn` + `F6`
General Play / Pause	`Fn` + `F9`
General Stop	`Fn` + `F10`
General Previous track	`Fn` + `F11`
General Next track	`Fn` + `F12`
General Mute / Unmute	`Fn` + `Print Screen`
General Volume down	`Fn` + `Scroll Lock`
General Volume up	`Fn` + `Pause`

Similar combinations for other applications