Sawtooth vibrato won't play back [

Hi, I'm trying to get vibrato sound on a trumpet and horn part. I'm looking for a wide virbrato. The wide sawtooth in Musescore 3 was perhaps a little too over the top but this seems extremely subtle and therefore doesn't come through the texture.

I added the large wavy line from 'line palette'.
clicked on wavy line
click on properties
changed the sounds [there are a choice of four wide vibrato, sawtooth etc ]
There is no obvious sonic change no matter which I select

Hope someone can enlighten me. Thank you.

I opened a new score and just tried this on a brass line on its own and I had the same issue.