LSA contains a JACK plugin, which enables ALSA-only applications to output to JACK using ALSA's emulation plug. First, make sure that alsa-jack is installed. Usually, it comes with alsa-plugins when its jack USE flag is enabled.
LASH is a session management system for JACK and ALSA audio applications on GNU/Linux.
NI Audio8 DJ with jackd & alsa: This configuration was tested with PD, ardour and mixxx (which uses a crappy pulseaudio plugin layer) and works flawlessly.
What is a .asoundrc file? Why might I want one?