Performance Tip: Amp Setup and Default Playing Volume
Crank your amp up to as loud as it will go, and then play at 40% of your capable volume as your normal volume. It will take time to get used to playing softly, but your dynamic range will benefit greatly from this. When it comes time to solo, go into 60% playing volume and people will have no problem hearing you. Jump into 80% volume every now and again for an exciting passage, but make sure to drop down again soon, it’s only to be used for dynamic effect. If you have a sound check, when they ask for you to play, play at that 40% volume. Don’t play at your “solo” volume (60%), otherwise they'll mix your solo volume as your "balanced" volume (matching the other instruments for an even level) and will thus take away your ability to be heard when you solo. Lastly, get your amp off the floor (one to two milk crates high) so that the sound is going to your ears, not your legs (less important with a Fender Bassman, but I commonly still do). Also get away from your amp. The further forward the better for a large amp—this makes a huge difference in hearing yourself on the bandstand.