Humming while duchening:

Our regular Cohen has a long melody he hums before saying the last word of each line while duchening. If I were a Cohen, I imagine my humming would go like this:
Hm, hm hm, hm-hm-hm humm hummm hum,
Hm, hm hm, hm-hm-hm humm hummm hum,
Hm, hm hm, hm-hm-hm humm hummm hum,
Hm HUMMM, (psst, chazan: what was that word again?)