You could check jacklaunch (jackasyn).
I think it's only for oss apps but it allows to run inside the jack server.  I
don't have snd at this moment so cannot test but it works with a bunch of
other apps (including games and all).
Dave Phillips wrote:
  Greetings:
   I'm having an interesting problem with JACK (0.81.1). When running it
 I can't start non-JACK apps, e.g., after starting JACK (with Rui's neat
 qjackctl) I'm unable to open Snd until I stop JACK. Is this expected
 behavior ? I hope not...
 Best regards,
 == Dave Phillips
        The Book Of Linux Music & Sound at 
http://www.nostarch.com/lms.htm
        The Linux Soundapps Site at 
http://linux-sound.org 
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      __  __ (_)___   Michal Seta
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