Hello
You can do it this way:
event_button id=1 fwd_id=sender:1 range=0:127 button_mode=toggle
event_sender hw_id=1 id=1000 fwd_id=led:1 type=SysEx stream="0xf0 0x00 0x01 0x16 0xE0 0x18 0x10 0xf7" if_equal=0
event_sender hw_id=1 id=1001 fwd_id=led:1 type=SysEx stream="0xf0 0x00 0x01 0x16 0xE0 0x18 0x01 0xf7" if_equal=127
Best
Zam