can you clarify what you mean? what is vibrato bass?
For any audition, you need to relax and be yourself, remember that they want you to do well, so show off...play fast pieces a bit slower so you demonstrate control..
don't overdo vibrato on picc because it will sound awful, very little will do. If you know your music well and prepare as well as you can, this should help your confidence which will, in turn, help you relax.
If you are not too familiar with vibrato and your audition is very soon, it may not be enough time to really get the hang of it. It's probably better to play with no vibrato at all than play with an uneven or completely over the top vibrato that isn't controlled.
good advice, a good vibrato is something that should develop naturally over time, if you force it, it will sound forced, not something you want...a pure straight tone is very beautiful when properly focused...
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