Some Roku devices, such as Roku TVs, also support:
VolumeDown
VolumeMute
VolumeUp
PowerOff
Roku TV devices also support changing the channel when watching the TV tuner input:
ChannelUp
ChannelDown
Roku TV devices also support keys to set the current TV input UI: InputTuner
InputHDMI1
InputHDMI2
InputHDMI3
InputHDMI4
InputAV1
It would be versatile to expose a "SetVolume" instruction that accepted a parameter:
curl -d "" http://000.000.0.0:8060/keypress/SetVolume/{1-100}
For example:
curl -d "" http://000.000.0.0:8060/keypress/SetVolume/25 #sets volume to 25%
need this too.. google voice can set to given percentage so must be a command for this.
Amazon Alexa can also set the volume on my TCL Roku TV to a specific value. I can say "Alexa, set family room TV volume to 55" and the volume gets set, so there must be a command that Alexa is using to set the volume directly.