BlocklyProp S3 - Modify default program to reduce volume

I have three S3s running in a room while 15 other students are working on other projects. The combined volume of the S3s is high.
The factory default program is in SPIN which I haven't used in years. I would be grateful for help to change the parameters to reduce the volume of the tones.
I have attached a copy of the file as comes from factory but re-named it to avoid confusion.

Thanks, John