They all compliment each other in tone and range, male, female and children. they can do very quiet and loud. there are some very good 'shouts' in wotan too (which can be achieved in programming a full velocity note in the syllable patch as well)
The syllable builder GUI is really great and all the libs are the same, you can export a phrase build into other choirs. attack and release curve faders are helpful too.
heres a quick export so you can hear the dynamics, soft/loud riding the mod wheel in the main syllable builder patch, (keep in mind there are lots of patches, legatos, divisions, clusters, whispers and shouts etc...) I haven't edited anything and its rather quiet with no mastering, be warned there's a shout midway through which is LOUD if you turned up your volume