Hi JanSidgwick,
Please have a look at this file:
https://www.amazon.com/clouddrive/share/N3i948RxIoLcKcMQa3ztqCykOtXJ7LWKdnBEG4rqWjT
The Sound Effector> Parameter> Weight slider is set to 100%
The Light is connected to the Weigh.Out of the Sample node
(The sound file is for educational use only, thanks.)
I’m not aware of any problems with Arnold and this setup. If needed, you might have to bake the Light> Intensity.
Let me know if there is any other question, I’m happy to look into it.
The Xpresso> Sample Node> Output> Strength is a combination out of several parts inside the Effector. This includes the Falloff. If you like to continue with the Strength output, you have to place a solid (100%) into the falloff field list.
Cheers, stay safe, stay healthy.