HELP NEEDED VIBRATING Bb

[waltzfordebby]

was at a recording session with my band when various notes on the upright bass started vibrating

open a (when bowed)
Bb on G and high Bb on G (thumb position)

i found i could fix the vibrations a bit by sticking a towel to the right f hole. (right hole when playing and looking down)
hoping to get this fixed as soon as possible wondering if there's anything i could do myself without taking it in to a luthier

[thedbassist]

its probably a wolftone.

[waltzfordebby]

it hasn't happened before... it was just out of the blue... something changed

[Basschair]

I believe I remember someone posting not too long ago, in which they mentioned a slippage of the sound post is related to wolftones popping up. I'll see if I can find the post: in the meantime, if there is a relationship then I imagine it could happen very quickly.

[Marc Piane]

Also the weather is changing this time of year. Check for cracks or opem seams.

[JoeyNaeger]

Sometimes wolftones develop over time. Try having someone hold the tailpiece while your playing. If the extra vibrations go away then you might consider getting a wolftone eliminator.

[Bob Branstetter]

It doesn't sound like a wolf to me, although it wouldn't hurt to check the soundpost. Ner the less, I'm with fingers - Look carefully for a old crack opening up or a seam opening.

[arnoldschnitzer]

Check for f-hole wing crack(s).