App: beQUIET pro
Developer: Jiulong Zhao
Genres: Bildung, Produktivität

As long as beQUIET pro is running, your Mac's internal speakers are disabled. Meanwhile, you may still listen through your headphone jack. Simply say, beQUIET pro only disables your internal speakers in any condition. 

beQUIET pro is designed for journalists, teachers, students, and other Mac users who would like to hear the sound but do not want to disturb others, such as in meetings, classrooms, courts, lectures, theaters, etc. 

Benefiting from your Mac's high-end hardware design, beQUIET pro guarantees that your speakers stay quiet and your headphones work no matter if you plug or unplug your headphones (the function that PC users can never dream about!)

This App is developed due to the request of a teacher who needed his computer lab to be quiet, but still, let the students enjoy the sound with their headphones.  

features: v3.20
- made for macOS Sierra 10.12 and still compatible with OS10.9 and above
- benefit from the core of beQUIET and the core was fully re-coded for macOS Sierra 10.12
- no need for any additional hardware 
- mute the startup melody of your Mac also
- check the internal speaker's status and mute them in real-time
- headphones' mute status and volume are not affected and can be freely adjusted
- saves and sets the speaker's volume automatically before and after running
- easy-to-use interface
- startup tip
- dark menu mode supported
- sandboxed Open at Login (autostart) function
- force quit is protected with a password
- dock icon is hidden and the status menu bar menu is password protected
- user password is saved in OS's keychain for maximum protection.

v3.20 -> v3.26
- option added: simplified menu mode

v3.26 -> v3.27
- menu rearranged
- performance improvements for macOS 10.13 High Sierra

v3.27 -> v3.30
- hack patch added: resume volume during status menu opening
- bug fixed: tip windows cannot be toggled while the app is background running
- bug fixed for macOS Mojave, all alert dialog box color under dark mode
- bug fixed for the dark mode of macOS Mojave. interface color mode switched accordingly
- bug fixed: About dialog box font color under the dark mode of macOS Mojave
- bug fixed: More Apps by dragonBTV link works again under macOS Mojave 10.14
- performance improvements for macOS 10.14 Mojave
- made for macOS Mojave 10.14 and still downward compatible with OS10.8

v3.30 -> v3.40
- Any Mac (Apple Silicon, Intel) version for macOS Big Sur
- launching Helper modified
- some alerts modified
- all deprecated functions rewritten

v3.40 -> v3.60
- deprecated code updated for Keychain wrapper
- feature added: mouse over the status menu bar icon will open the active menu
- bug fixed: enter key after password input works now
- bug fixed: app refuses to quit occasionally even correct password is inputted
- deprecated code and alert for auto launching feature rewritten
- status menu bar icon changed to green while muting the speaker
- startup tip fully re-written
- all deprecated functions rewritten
- auto open at login help updated
- More by dragonBTV menu updated

dragonBTV
Los Angeles, California

Release notes:
v3.40 -> v3.60
- deprecated code updated for Keychain wrapper
- feature added: mouse over the status menu bar icon will open the active menu
- bug fixed: enter key after password input works now
- bug fixed: app refuses to quit occasionally even correct password is inputted
- deprecated code and alert for auto launching feature rewritten
- status menu bar icon changed to green while muting the speaker
- startup tip fully re-written
- all deprecated functions rewritten
- auto open at login help updated
- More by dragonBTV menu updated