Hello Jan.
I think it would be great if you make the treshold lower than -40 in future versions. Lots of radio stations use Axia Livewire sound system. There are no sound cards at all - Livewire utilizes AoIP (audio over IP, like SIP, may be you know), and sound level may be even -90 dBFS, for example. Nominal audio level in Livewire system is -20 dBFS. Sometimes the level falls below -40 dBFS for a long time, and false alarms occurs. There are no problem to set the alarm activation time a little bit longer, but in this case we lose the possibility to detect short periods of silence.
Example: we have a task to detect short and rare audio "drop-outs" in digital audio system. It may take place when an ethernet card begins to glitch. We set the alarm time to 1 sec, treshhold to -40 dB... and our "Inbox e-mail" is full of false alarms. It's a pity. Many modern songs have quiet places, and Silence Detector triggers on it. But if we have the possibility to set the level to -96 dB, we could solve the task. So, it would be VERY useful to set the level lower than -40.
Thank you in advance.