[LAU] Problem getting started with Midi editing - no sound!

[Ralf Mardorf]

On Tue, 15 Sep 2015 17:56:56 +0100, David Sumbler wrote:
> card 1: Speaker [USB Speaker], device 0: USB Audio [USB Audio]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
>
>I have 2 USB speakers connected to this computer.

Depending on how you set up your machine it could happen that the card
number of the USB speakers changes, aplay -l shows you. We can fix that
later, first let's test if the following works.

Run

killall -9 pulseaudio jackd; jackd -dalsa -dhw:<card number> -r48000 -p1024 -n2 -P
                                          ^^^^^^^^^^^^^^^^^^
IOW for the above aplay -l output run

killall -9 pulseaudio jackd; jackd -dalsa -dhw:1 -r48000 -p1024 -n2 -P
                                          ^^^^^^     
AFAIK you could use "Speaker" too, try running

killall -9 pulseaudio jackd; jackd -dalsa -dhw:Speaker -r48000 -p1024 -n2 -P
                                          ^^^^^^^^^^^^
this should always work.

Assumed pulseaudio is installed and running, disable it. I don't know if
killall will do the job.

Some subscribers might recommend to use pulseaudio with jackd, but do
yourself a favour and drop pulseaudio.

Another issue is duplex mode. In the above tests jackd is set up for
playback only.