I'm considering this small bass amp, primarily for practising at home: http://www.amazon.co.uk/Vox-PATHFINDER-Combo-Bulldog-Speakers/dp/B002YC36ZI
A few people have said it's also capable for small venues, or on-stage, but it has the common practice feature that plugging in to the line-out silences the main speaker. This is unhelpful for using it on-stage, where you would perhaps like to use the amp for stage sound and feed the line-out into the mixing desk. Of course you could mic it but we tend not to do that for bass amps.
I'm sure this will vary from amp to amp but can someone give an informed opinion/educated guess whether these type of amps lend themselves to simple modifications, such as disabling the silent practice mode? Is it likely to be a very simple circuit (disconnect a wire) or some computer-controlled chip/circuit-board that makes this impracticable?