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What's great about the Inteset remote is it gives you access to discrete commands like the volume and mute for the streambar by using efc's, these are 5 digit codes for individual functions. So you have to map each one at a time:
Volume Up
1. Under the Roku device code 03061
2. press and hold SET for two blinks release
3. enter 9 9 4
4. tap SET for one blink
5. enter 0 0 1 3 4
6. press VOLUME UP KEY
repeat for volume down:
1. Under the Roku device code 03061
2. press and hold SET for two blinks release
3. enter 9 9 4
4. tap SET for one blink
5. enter 0 0 1 3 6
6. press VOLUME DOWN KEY
For mute:
1.Under the Roku device code 03061
2. press and hold SET for two blinks release
3. enter 9 9 4
4. tap SET for one blink
5. enter 0 0 1 4 0
6. press MUTE KEY
These commands initiate CEC signal in the Roku which sends a command over the HDMI cable to control the tv its connected with.
Here is the original article in the Roku Forum,
Volume Up
1. Under the Roku device code 03061
2. press and hold SET for two blinks release
3. enter 9 9 4
4. tap SET for one blink
5. enter 0 0 1 3 4
6. press VOLUME UP KEY
repeat for volume down:
1. Under the Roku device code 03061
2. press and hold SET for two blinks release
3. enter 9 9 4
4. tap SET for one blink
5. enter 0 0 1 3 6
6. press VOLUME DOWN KEY
For mute:
1.Under the Roku device code 03061
2. press and hold SET for two blinks release
3. enter 9 9 4
4. tap SET for one blink
5. enter 0 0 1 4 0
6. press MUTE KEY
These commands initiate CEC signal in the Roku which sends a command over the HDMI cable to control the tv its connected with.
Here is the original article in the Roku Forum,