What you want are commands via the JSON interface, and the documentation for it can be found under the MicroMPX documentation here:
The general syntax for sending a command to a parameter (e.g., parameter 121) is:
Code:
http://[IP]:[PORT]/json-1/list{"[ID]":{"new_value":"[VALUE]"}}
For parameter 121 (which typically refers to SCA1 Enable in Stereo Tool):
To Activate (Enable):
Code:
http://127.0.0.1:8080/json-1/list%7B"121"%7B"new_value":"1"%7D%7D
To Deactivate (Disable):
Code:
http://127.0.0.1:8080/json-1/list%7B"121"%7B"new_value":"0"%7D%7D