[gentoo-user] jack vs jack2 USE-flag-wise?

[tuxic]

Hi,

I want to set 'jack' as a default USE flag - bu my system is a 
multicore/multithreaded on...so I need not jack aka 

    media-sound/jack-audio-connection-kit

but I think I need this one:

    * media-sound/jack2
        Description:         Jackdmp jack implemention for multi-processor 
machine

what USE flag pulls this one instead the first one?

Cheers!
Meino