docs: private void recordMount(SlotReference slot) {
          if (mediaMounts.add(slot)) {
              deliverMountUpdate(slot, true);
          }
          if (!mediaDetails.containsKey(slot)) {
              try {
                  VirtualCdj.getInstance().sendMediaQuery(slot);
              } catch (Exception e) {
                  logger.warn("Problem trying to request media details for " + slot, e);
              }
          }
      }