Feature: Allow switching presets using hotkey

[Xenira]

Disclaimer:

• I have checked for a similar issue and sure it hasn't been reported before.

Description:
I would like to switch the current preset using a hotkey. As a rudimentary example to switch between 'Music-Mode' and 'Voice-Mode'. This could be implemented with [somekey] + [arrow up/down] to switch one up/ down or [somekey] + [1-9] to select a specific preset. Maybe display a toast/notification with the name of the newly selected preset.

User flow & interface:
This could be configured using the settings menu. For switching up/down it would suffice to be able to change the hotkeys here. For switching to a specific preset an assignment to the numbers would be needed.

[samyk]

I've created a crude enable/disable function of eqMac by using Keyboard Maestro to open it, locate the on/off icon, detect whether on or off, and click if wanting to toggle it. This allows you to then apply a hotkey, run at specific time, or other arbitrary control via Keyboard Maestro.

Macros available here and are very generalized: https://github.com/samyk/samytools/tree/master/keyboardmaestro

[porg]

To encourage the developer:

• Possibly you don't need to implement the hotkey administration yourself.
• You could outsource this to: System Settings → Keyboard → Keyboard Shortcuts
  • Is a standard mechanism offered by macOS to manage/customize shortcuts
• Particularly "Services" shortcuts are interesting
  • With Automator you can easily build a service which executes an AppleScript or shellscript controlling your app.
  • macOS then always listens to that global shortcuts, and whenever pressed invokes the service.

I guess that's insinuated by #492