volume: format_down or equivalent if sink does not exists

[Sayrus]

Just like ethernet or ipv6, a sink might not exists (example: a bluetooth device is only a sink when connected).

How about having a format_down to make the difference between a device not connected and a sink at 0%? It seems that currently only format and format_muted are supported.

Example configuration:

volume volatile {
        format = "DEV: %volume"
        format_muted = "DEV: muted (%volume)"
        format_down = ""
        device = "pulse:DEV_NAME"
        mixer = "Master"
        mixer_idx = 0
}

I don't know the behaviour on something else than pulseaudio but it makes sense on pulseaudio.

[Airblader]

Makes sense to me.