Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency audio

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To: linux-audio-user <Linux-audio-user@...>
Date: Wednesday, May 8, 2013 - 12:05 pm

2013/5/5 Carlos sanchiavedraz :

>> [...]

(On last few days I sent two more responses but... only to Nicola
instead to the list, so here they are. Things that happen.
And I add one more step)

>>

One step more, this time with success.
Given the situation mentioned before I tried to step back a little.

First, I tried only to run jack using jackstart script again. A few
tweaks and could make jack to work, but sound had glitches and
crackles whatever config I tried.

Second, I stepped back a little more.
I executed again Ampbrownie setup.sh with option 2 (update and install
additional packages). During this it changed jackd2 to jack1
uninstalling it. This could be installed before as a dependence of
some of the apps I installed in addition to those that setup.sh script
install (maybe sooperlooper or rakarrack, not sure).
Then, I noticed during rebooting that USB is only 1.1, so I changed
the hardware switch on the back of the UA from advanced driver to
normal.

One more reboot and... Voila! Sounds was almost perfect and delay
acceptable, practically RT, connecting in to out and using Rakarrack
with some basic effects.

Don't know if this success is due to some newer versions it appears to
have been updated on repos that are newer than those installed on
first run of setup.sh, or maybe some of the modifications mentioned
flicked the switch.

I made a backup with dd, of course, and I'm moving towards setting up
RPi as a Jam/Improv/Live headless station: boot an then run Rackarrack
as a multifx connected to Sooperlooper/Freewheeling as a looper, using
an external audio card and a MIDI-USB pedalboard. And then improving
step by step until reaching the limit on RPi processing and
overclocking.

In the future I have more plans in mind, but for now that's it.

BTW, I managed to connect a second usb device without RPi rebooting
because of problems with power with two USB power adapters.
So now I have:
- 1 USB power adapter to the RPi,
- 1 USB stick for the system partition on USB port1,
- 1 4 USB hub on USB port 2 (where external audio card and MIDI-USB
pedalboard is connected)
- 1 USB power adapter to the second mini-USB port on the MIDI-USB
pedalboard that helps to feed it and to stable the overall setup.

I think both USB power adapters are mobile adapters, I think 0,7A and
0,5A, so maybe with just one USB power adapter at 2A for the RPi I
could connect all this and a qwerty keyboard and something else, which
now I can't. That or just a powered USB hub, but that is more
expensive.

Hope it helps.
Thanks all and Regards.

--
Carlos sanchiavedraz
* Musix GNU+Linux
http://www.musix.es
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Messages in current thread:
Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency a..., Carlos sanchiavedraz, (Wed May 8, 12:05 pm)
Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency a..., Carlos sanchiavedraz, (Tue May 14, 8:06 am)
Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency a..., Jeremy Jongepier, (Tue May 14, 10:07 am)
Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency a..., Carlos sanchiavedraz, (Tue May 14, 11:51 am)