This is a simple application to control one of the Alsa's mixer volume in tray.

Application uses GTK+ interface via gtkmm library

Build Deps:

- gtkmm-3.0 (libgtkmm-3.0-dev package in Ubuntu)
- gtkmm-2.4 (only for gtkmm-2.4 support) 
- glib (libglibmm-2.4-dev package in Ubuntu)
- alsa/asoundlib (libasound2-dev package in Ubuntu)
- libpulse (only for pulseaudio support / optional)
- cmake >= 3.5.0
- libappindicator (libappindicator3 for GTK3 / optional)
- libdbusmenu-gtk2 (libdbusmenu for GTK2 / optional)
- libdbusmenu-gtk3 (libdbusmenu for GTK3 / optional)
- glib2-devel (for glib-mkenums binary)

Howto build application:

if You have cmake installed

mkdir build && cd build

cmake ..

make

to build with pulseaudio support:

cmake -DUSE_PULSE=ON ..

make

to build with gtkmm-2.4 support:

cmake -DGTKMM=2 ..

make

to build with libappindicator support:

cmake -DUSE_APPINDICATOR=ON ..

make

to build with StatusNotifier support:

cmake -DUSE_SNI=ON ..

make

to disable DBus menu dependency (if USE_SNI flag enabled):

cmake -DUSE_DBUSMENU=OFF ..

make

What features available:

- sound card selection
- sound card mixer selection
- volume control by "scroll" on tray icon
- volume control using popup window with slider
- mute sound on middleclick and by checkbox selection
- enable or disable sound card switches in settings dialog
- use PulseAaudio volume controll (optionally)

Warning!!! With AppIndicator in KDE5 the scroll-event is not working. Use Restore menu item to control volume with slider.