Oh God, I meant to 'unfollow' this thread. OK... Back in the real world, where you've got a shed-building drummer a foot from your ear and two guitarists having a show-off volume competition as usual, the singer's falling down drunk and the guy on the desk is a clueless a r s e, I'd say that even the best pedal compressor, set to its optimum value for the situation, would be hard-pushed to make the bass sound any better to anyone in the room, including the bass player.
I really don't have a problem with bass players who want to use a pedal compressor - it's a free country (well it isn't, but you know what I mean) - however, IN MY OPINION a pedal compressor is of limited use TO ME. And I do know how to use a compressor. But I like to keep things simple at gigs: Fingers, bass, lead, amp.
In conclusion, I put forward the contention that anyone who can use a pedal compressor on bass - for remedial non sound-shaping purposes - and demonstrably produce a positive difference in a live situation - and without using compression on any other instrument or vocal - is probably a sound engineer first and a bass player second. Most bass players are bass players first and sound engineers... not at all.
AND NO-ONE LISTENS TO THE BASS ANYWAY!