jackd + fluidsynth (Debian 7 'Wheezy' / 8 'Jessie')

1. In Debian 7 'Wheezy'

1) $ jackd -d firewire -n30 -I30 -O30 -r48000&

2) $ qsynth &

2.1)

2.2) (This is something like "fluidsynth -a pulseaudio -i /usr/share/sounds/sf2/FluidR3_GM.sf2 -i /usr/share/sounds/sf2/FluidR3_GS.sf2 -m alsa_seq -r 44100 -s -g 1 &"

#\

3)  $ frescobaldi &

2. In Debian 8 'Jessie'

You'd probably wish to start jackd with qjackctl: