For keybord without multimedia key
ctrl + alt + Q - exit
ctrl + alt + SPACE - play/pause
ctrl + NUM0 - play/pause
ctrl + INSERT - play/pause
ctrl + alt + * - play/pause
ctrl + alt + + - volume up
ctrl + alt + ↑ - volume up
ctrl + alt + - - volume down
ctrl + alt + ↓ - volume down
ctrl + alt + -> - next track
ctrl + alt + <- - prev track