[Bug 299359] snd_uaudio: Add feature to control the passage of specific MIDI events by sysctl

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=299359

--- Comment #2 from Tatsuki Makino <tatsuki_makino@hotmail.com> ---
(In reply to Christos Margiolis from comment #1)

The reason I think the parts of this patch involving the variable
chan->sysctl.through_timing_clock are necessary seems to be exactly the same as
the reason why the '-t' option is implemented in mididump :)
When mididump is run by default, there is no output related to the timing
clock, but with the following command there is output, and it seems there is no
way to stop it.

midicat -d -o /dev/null -q rmidi/0
aseqdump -p 1:0
jack_umidi -d /dev/umidi0.0 -n jack_midi & jack_midi_dump & jack_connect
jack_midi-umidi0.0:midi.TX midi-monitor:input

Active sensing also occurs every 300 ms, but it flushes the characters on the
terminal.
It seems that it would be difficult to use it to check the survival of devices
if multiple devices are connected and used with a single software.
In such cases, is it conceivable to stop active sensing only for devices that
do not require a check for survival?

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