Correct, the Harmony 900 does NOT support the activity sequence feature, but the Harmony One does. You can use the Device Learn IR in RAW mode to teach a sequence of 2 commands under a single command name. Some people with nerves of steal can teach a sequence of more than 2 commands. You have to be quick and consistent. It's easier if you can squirt the sequence from another remote like your Harmony One. You could create the desired sequence mapped to an activity button on the Harmony One, then teach that sequence to the Harmony 900 using the Device Learn IR in RAW mode. Don't forget to change the default command name (MyNewCommand). Note: To enable learning in RAW mode, click "Custom" at the bottom right of the learning page (on the left of Done).