Filters: SOS - provide version for scalar arguments

Signed-off-by: Tim Blechmann <tim@klingt.org>
sclang: don't join UDP threads

ugly, but prevents deadlock

Signed-off-by: Tim Blechmann <tim@klingt.org>
sclang: only apple has a resync thread

Signed-off-by: Tim Blechmann <tim@klingt.org>