No channels yet.
Play something in a tab, then click the halo-halo tab button in
your Chrome toolbar while that tab is in front. That is the only way to add a
tab — Chrome only lets an extension capture audio from a tab you have explicitly
invoked it on.
Tape
Mix
Cast
The mix comes out of this tab, so casting this tab sends both
the sound and the video grid. The captured tabs keep playing in the background —
you do not cast them, and you should not.
Press set up for casting.
Open Chrome's ⋮ menu and choose Cast, save and share → Cast.
Pick your device, then set Sources to Cast tab.
Untested against real hardware. An extension cannot start a cast or see
whether a device is there, so nothing here can check itself — if the menu does
not behave as described, that is worth reporting.
MIDI
No channels yet.
Click the halo-halo tab button in your toolbar while a tab is
playing. Its video appears here.