Simon 5 is coming soon!
Simon version 5 is currently in beta testing. It is a massive update, introducing a much-requested feature: syncing the Simon data between multiple Macs, plus a Simon Status service, a Link Checker filter, improved Find filter, iMessage and Speak Error notifiers, a new app icon, and much more.
Important: please note that Simon 5 requires a minimum of macOS 10.12 (Sierra), and will be a paid upgrade from Simon 4 after the beta. Purchasers since September 1, 2020 automatically get a version 5 license (that also works in previous versions).
Re: Volume slider controls for spoken alerts
Ah, yes — that is a bug. Interesting that it hadn't been reported before this... I guess most people leave it at maximum. The maximum volume is the system volume level; it shouldn't be louder than the system beep volume.
I'll fix this for the upcoming 2.4 release. Thanks for the bug report!
So it is.
I just tested. Yes, it is relative to the system volume. Just louder than I expected.
That's probably a good thing in a server room.
Re: Volume slider controls for spoken alerts
Fixed for version 2.4b2.