mine also started crowing a really weird hilarious sounding crow...you might want to try to look up a few videos on youtube to hear it.
another note, 4 of my roosters acted like i was killing them when i put the collar on. They hunched down and shot backwards, then stood in a corner moping around. By day two them were normal, but don't give in and take it off, no matter how much he thinks your killing him.
Hi just thought I'd let you know how pleased I am with my rooster collar ,with my first batch of chicks along came Elvis a much loved appenzeller roo, after 2 weeks of crowing ( much to my delight ) the noise and pollution officer visited to inform me someone had reported his delightful tones . In total panic I ordered a no crow rooster collar ,the results were immediate,it took about 2 weeks to adjust the collar as I put it on quite loosely to begin with allowing him to get used to it ,yes he kicked off big style all the girls were having a peck too trying to help him out of it ,I now have three Roos of various breeds (all by accident )I now make my own roo collars with Velcro lined with felt .if I had a choice they would crow away merrily but atl least this way I get to keep my handsome boys ,give it a try ,good luck .