This just covers Lennart's concern over the terminology used.

The majority of this change is simply the following command:
 grep -rli sync[-_]volume . | xargs sed -i 's/sync_volume/deferred_volume/g;s/PA_SINK_SYNC_VOLUME/PA_SINK_DEFERRED_VOLUME/g;s/PA_SOURCE_SYNC_VOLUME/PA_SOURCE_DEFERRED_VOLUME/g;s/sync-volume/deferred-volume/g'

Some minor tweaks were added on top to tidy up formatting and
a couple of phrases were clarified too.