Yep; got it to work… The trick was in following your steps in “Setting sound and volume off/false” … then changing settings… Then set send sound/volume true/on again…
Edit: It’s not very intuitive… because the logical thing seems to “Just set and forget”…
The following list still applies, but use the steps discribed above by @orangebucket to set the sounds if using the Edge driver.
Browse - also the main/parent sound control of Siren 6
Tamper - known as sound 2 in the list of controllable devices, this controls the sound/volume played when the vibration sensor or tamper sensor is triggered (when you move the Siren 6 too often).
Button one - determines the sound/volume of button one when pressed, or when Sound 3 is controlled from SmartThings.
Button two - determines the sound/volume of button two when pressed, or when Sound 4 is controlled from SmartThings.
Button three - determines the sound/volume of button three when pressed, or when Sound 5 is controlled from SmartThings.
Environment - determines the sound/volume when Siren 6 receives a environment type z-wave alarm command. (ie. smoke sensors, CO2 sensors, etc)
Security - determines the sound/volume when Siren 6 receives a security type z-wave alarm (ie. motion sensors, door sensors, etc)
Emergency - determines the sound/volume when Siren 6 receives a emergency type z-wave alarm.