Covered Sound Holes

[caeman]

I am watching Gnarls Barkely on Austin City Limits tonight, watching the different musicians doing their thing, and I noticed that the bass player's upright has the sound holes covered.

I don't play upright, so I am curious why a player might do this.

[Lo-E]

Helps reduce feedback.

[caeman]

Originally Posted by Lo-E

Helps reduce feedback.

Thank you.