app nows obtain channel numbers from the coreaudio

app nows obtain channel numbers from the coreaudio instead of using statically 1(volLeft), 2(volRight)

More error information

in order to get more information about errors, result codes now print…

…ed to console

Light Theme support

Black volume icon has been added for the light appearance

Catalina support

Added Catalina(10.10) support
Added true mute setting

1.1

nsslider now more stable

1.0

You can use VolumeUP, VolumeDOWN, VolumeMUTE buttons to change the volume of aggregate sound devices
You can use popover menu to adjust the volume