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[kdoren]

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[jp8]

Hi Kevin,
In the README, you mention the Pi has issues with USB hotplug. Do you have any details about it? For me it seems to work, but I am wondering if there is something I should watch for.
Kind regards,
JP

[kdoren]

Main issue is hardware, but software issues are also possible.

The hardware issue is that you can easily crash the Pi. Hot-plugging a USB device into a Raspberry Pi, especially something like a USB-powered audio interface, can cause a power glitch & crash (it's power supply and filtering don't seem to handle this very well).

The software issue is that, depending on what you plug in, a reboot might be required in order for the device to be properly recognized. In my opinion, software handling of hot-plugged USB devices in linux leaves something to be desired.

You can hot-plug a USB mouse or keyboard and be fine. But USB-powered audio interface? I advise against it.

[razze2006]

Hello,

I'm not an experienced linux user, but I wanted to try and use a Pi4b to run jamulus as a portable alternative to my laptop. At the moment i'm struggling to even get my Presonus Audiobox USB 96 to even get connected to the Pi!
I'm getting an endless cycle of the device being recognised and then found not to be an MTP device and subsequentluy disconnected.

Any library i need to install? libmtp perhaps? I'd love to hear any ideas :)

Cheers,
Marco

[kdoren]

@marco Carlos got this working with his A96.
Here's what did the trick:

# in /etc/jackdrc.conf
DEVICE=hw:A96

[razze2006]

Nice to wake up and somebody hands you the solution to the problem you had before you went to bed. I'll test today and report

[CAguayo]

I am seeing this same issue, but am an experienced Linux user, but not an audio expert. I would be happy to help diagnose, maybe discuss in the Slack channel? Thanks, Carlos

…

On Thu, Jan 7, 2021 at 10:08 AM razze2006 ***@***.***> wrote: Hello, I'm not an experienced linux user, but I wanted to try and use a Pi4b to run jamulus as a portable alternative to my laptop. At the moment i'm struggling to even get my Presonus Audiobox USB 96 to even get connected to the Pi! I'm getting an endless cycle of the device being recognised and then found not to be an MTP device and subsequentluy disconnected. Any library i need to install? libmtp perhaps? I'd love to hear any ideas :) Cheers, Marco — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABKJTEZRHG5C3L4EF4W3SATSYX2AXANCNFSM4VH63KSA> .

[razze2006]

I'll set up slack and try. Should there be a slack workspace i should be able to join with the email I use to log into github? I'm in the uk, so I'll have to wait until tomorrow to do it

[CAguayo]

The slack team I mentioned can be joined by following this link: https://join.slack.com/t/jacktripcollaboration/shared_invite/zt-g3iz2nkh-d9tQeOZItS30SZUELaXf1A The #jambox channel is where relevant discussion would be found. Carlos

…

On Thu, Jan 7, 2021 at 2:24 PM razze2006 ***@***.***> wrote: I'll set up slack and try. Should there be a slack workspace i should be able to join with the email I use to log into github? I'm in the uk, so I'll have to wait until tomorrow to do it — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#1 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABKJTE7OLJV732IXPW7P6JLSYYYBFANCNFSM4VH63KSA> .

[razze2006]

I joined, thanks. I'm going to use jambox for jamulus, but the setting up of the audio interface should be common to both jacktrip and jamulus

[Ghost6772]

Hello
i do not know anything about linux, but i am using the jambox image on a RasPi.
Now i wonder how i could start Jamulus as a server. I thing i just have to add the parameter -s. But where?
How/where can i find the right file an what do exactly do i have to do there?

[kdoren]

@Ghost6772
I have jamulus server configured as a systemd service, to start it:

sudo systemctl start jamulus-server

If you need to make any configuration changes, this should be done in /home/pi/.config/Jamulus/jamulus-server.conf

This is descibed in the desktop README.md file

• Running a Jamulus Server
  • Jamulus server can run on Raspberry Pi. It's best run on its own separate box. Running on the same Raspberry Pi that runs a Jamulus Client will increase jitter.
  • Your internet connection needs enough upstream bandwidth to send streams to multiple clients. DSL and Cable internet typically don't have very much.
  • You router will likely require port forwarding set up.
  • Customizable Settings are described in file /home/pi/.config/Jamulus/jamulus-server.conf
  • jamulus-server doesn't need the "jack" service, so stop it unless you're running a client: "sudo systemctl stop jack"
  • To start: "sudo systemctl start jamulus-server"

[Ghost6772]

Hey, many many thanks for the quick reply.
Yes, i will use a separate box. And Port forwarding is no problem I know how to configure this.
My internet bandwidth is 300 Mbps download and 30Mbps upload. Do you think this will work?
I tried the two sudo commands stop jack and start server. They both work fine. Thanks a lot.
But i cannot find the /home/pi/.config/Jamulus/jamulus-server.conf
What does the little dot before config meamn? I cannot find a config directory in /home/pi/
Sorry, but these are my first steps with raspberry and linux
Many thanks

[kdoren]

@Ghost6772 the little dot before config is what makes it a hidden directory (that's standard for a user's config directory in this distro). In the file manager, you won't see this directory unless you select View -> Show Hidden.

You should be able to copy and paste the following command into a terminal window to see/edit it.
To copy/paste in noVNC is 2 steps, first you need to paste into the clipboard that pulls out from the left, then you can edit -> paste in the terminal window. FYI "~" is short for /home/<user> ( in this case /home/pi )

leafpad ~/.config/Jamulus/jamulus-server.conf

[Ghost6772]

Thank you so much for your answer in the middle of the night :-)
It worked fine!

[Ghost6772]

Which is correct image version?
Is the Jambox release 1.2.0 only for RasPi with 8GB Ram, or will it work even fine on a Raspberry with only 4GB?
Or do I have to use an older image for RasPi 4GB?

[kdoren]

@Ghost6772 version 1.2.0 is the latest release, it should work on RPi4 of any memory size. RPi3 should also works. RPi400 works but currently requires a change in /boot/config.txt.

[Ghost6772]

Hi, we tested the jambox today with 4 raspberries to connect. But we had problems with Jamulus and with sonobus.

1. One of the raspberries said: ALSA Device card 2 not availiable: PLAY_RESULT: 1, RECORD_RESULT:1 (when trying to start Jamulus, but it worked with the same type of audio interface here when I tested it.)

2. Sonobus started without problems on each rasberry and everyone could connect. But then one of us lost connection an it said we should enable port forwarding on the router. But i cannot check the option in sonobus. I can check, but sonobus looses the check when leaving the option window.

Maybe anybody has an idea?

Many thanks :-)

[kdoren]

@Ghost6772

1. the Jamulus/sonobus start scripts are looking in /etc/jackdrc.conf for DEVICE to figure out what audio device is in use. Inside /etc/jackdrc.conf, If you haven't set value for DEVICE, by default it will choose the last capture device it sees (by running "arecord -l"). If that's not the device you want, you can hard-set a value for DEVICE, in the form DEVICE=hw:n,0, where n is the card number shown in "arecord -l".

So (1) what do you see when you run "arecord -l"? do you see the interface listed?, and (2) did you set "DEVICE" in /etc/jackdrc.conf, and if so, to what.

2. If your router requires you to set up port forwarding, that's done in the router itself. What option were you trying to set in SonoBus that lost the setting?

[Ghost6772]

Hello,
the "arecord -l" command can i test only in a couple of days because the raspberry is not here. I gave it to a friend. I will give you feedback then.

In SonoBus it's the option "use specific UDP port" i tried to check. Because otherwise i will not know which port i should configure for portforwarding in my router.

Many thanks :-)

[kdoren]

@Ghost6772 Settings changes should save. If they aren't saving, try a different micro SD card. Another test: write something to a file, and make sure you can read it after a reboot.

[Ghost6772]

In general setting changes do save. e.g the option "autoreconnect to last group" works fine. Only the option "use specific UDP port" does not save. But i will try what you said. New card , new flash, new luck :-) I will give you feedback then.....

[ve3meo]

I've had a Pi 4B kit for over a week and was struggling to get it to drive an old DVI monitor whose power supply I repaired just for this purpose and which worked up to a month ago with my laptop's HDMI port. No success there so I plugged it into the replacement monitor, installed Jamulus on Raspbian and tried to get it going. No luck sorting out Jack. So I finally read through the JamBox instructions and finally succeeded in flashing an image onto the 4GB card I pulled from my wife's defunct Kobo Reader. Fired it up and voila! JamBox sorted out the first audio interface I tried. More on that later. And noVNC/urlrelay works a charm on my pc but not my old iPad 2 nor the phones (screen too small). I imagine the iPad's browser does not support JavaScript.

Thanks, Kevin!

[kdoren]

@ve3meo I personally use an iPad in my setup, but not one that old, I think mine is a 2018 model. It works fine with noVNC, with several different browsers (I usually use Safari but Firefox/Chrome also work). Works in a phone too - the small screen is awkward, but is OK in a pinch if you need to get in, launch and connect.

[ve3meo]

@kdoren so no tablet but I dug out a 18-year old IBM ThinkPad T41 from a box in the basement. After trying my Jamulus-OS stick on it and being told it was i686 CPU and not 64-bit and so it wouldn't work, I let it boot up to Windows XP to see if its browser would work with noVNC. It finally did after some minutes probably doing an update of Chrome from 32 to 49, the last version offered for XP. To my delight, it succeeded and seems to work very well. I loved that old machine: quiet, comfortable, 1080X768 screen's still bright.

I tried 3 USB adapters, a Logitech H590 USB headset and Roland QUAD-CAPTURE USB audio interface. All but the Roland were found by your auto setup routine.

1. Trond AC2: seems stable, low latency but needs a high output TRRS headset or mic/earbuds which I don't have
2. Trond AC3: versatile in that it can take TRRS or a TRS mic and TRS headphones; also low latency but suffered from some drifting in and out of a buzzsaw distortion of the audio; maybe higher mic gain than AC2 but not enough for my earbuds mic.
3. plugable(TM) USB-AUDIO: stable, higher latency, stereo input and output, really more like line level sensitivity. That's what's pictured and I've settled on for now. Had to plug my 35-yr old Realistic dynamic mic into my 45-yr old Yamaha Hi-Fi stereo and run its headphone output across the room to the plugable input. The plugable is a hissy device; the RTLutility reported a noise floor of ~-65dBFS.
4. Logitech H590 USB headset: same issue as I experienced on other systems. It has active mic noise suppression that cannot be turned off and gates the microphone off or lowers its gain below a certain volume. Also has an overly active AGC for the headphones and can crank up the gain to the point of feedback howl (maybe defective in that it should then reduce gain but it can howl on)
5. QUAD-CAPTURE: wasn't surprised. I don't think it was produced to support Linux but I must admit I didn't even check to see if it started - maybe the Pi power supply through the USB port couldn't deliver the current needed.

The ThinkPad has a 1.6GHz Pentium with 1GB RAM, running Win XP Pro 2002 SP3. My Pi has 4X the cores, twice the arithmetic width and 4X RAM!

[kdoren]

@ve3meo @CAguayo Even the cheapest USB Audio Interfaces can have internal controls and switches that might be useful (sometimes a bewildering array of them) They're not necessarily exposed through any GUI, but you might be able to get to them via the "amixer" command.

For example, it might be possible to disable AGC. Here's a cheap one (Sabrent I think, card 1 in this case) that has AGC:

# look for a control with "Auto" in the name
pi@jambox:~ $ amixer -c 1 | grep Auto
Simple mixer control 'Auto Gain Control',0

# get the value of mixer control "Auto Gain Control
pi@jambox:~ $ amixer -c 1 cget iface=MIXER,name='Auto Gain Control'
numid=9,iface=MIXER,name='Auto Gain Control'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on

# set "Auto Gain Control" off
pi@jambox:~ $ amixer -c 1 cset iface=MIXER,name='Auto Gain Control' 0
numid=9,iface=MIXER,name='Auto Gain Control'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off

If you find the magic command that disables AGC, you could put it in /etc/jackdrc.conf (that file is sourced so any commands in it are executed). Then it will get executed whenever Jamulus starts or jack is restarted.

The cheap audio interfaces typically have poor power supply filtering, and the Pi has noisy power (Pi4 is better than Pi3). Trashy power + poor filtering + mic preamp = noise problems.

Glad you found a use for your T41; I still have a couple of T40's lying around, they were great laptops for their day.

[chrisclev]

My band mate has a Roland Quad Capture UA55 card. It is not USB class compliant so won't work with the Pi. The clue was that it needed a driver for Mac. I wouldn't expend any more effort on that one!

[CAguayo]

Thank you, Kevin, I hadn't come across this super-useful tidbit anywhere, and I have been studying up on amixer, because our group has a need to control mic gain and/or volume, and I can imagine putting into some handy scripts with a gui icon. I am going to work on this, so let me know if you beat me to it. ;-) Carlos

…

On Tue, Feb 2, 2021 at 6:28 PM Kevin Doren ***@***.***> wrote: @ve3meo <https://github.com/ve3meo> @CAguayo <https://github.com/CAguayo> Even the cheapest USB Audio Interfaces can have internal controls and switches that might be useful (sometimes a bewildering array of them) They're not necessarily exposed through any GUI, but you might be able to get to them via the "amixer" command. For example, it might be possible to disable AGC. Here's a cheap one (Sabrent I think, card 1 in this case) that has AGC: # look for a control with "Auto" in the name ***@***.***:~ $ amixer -c 1 | grep Auto Simple mixer control 'Auto Gain Control',0 # get the value of mixer control "Auto Gain Control ***@***.***:~ $ amixer -c 1 cget iface=MIXER,name='Auto Gain Control' numid=9,iface=MIXER,name='Auto Gain Control' ; type=BOOLEAN,access=rw------,values=1 : values=on # set "Auto Gain Control" off ***@***.***:~ $ amixer -c 1 cset iface=MIXER,name='Auto Gain Control' 0 numid=9,iface=MIXER,name='Auto Gain Control' ; type=BOOLEAN,access=rw------,values=1 : values=off If you find the magic command that disables AGC, you could put it in /etc/jackdrc.conf (that file is sourced so any commands in it are executed). Then it will get executed whenever Jamulus starts or jack is restarted. The cheap audio interfaces typically have poor power supply filtering, and the Pi has noisy power (Pi4 is better than Pi3). Trashy power + poor filtering + mic preamp = noise problems. Glad you found a use for your T41; I still have a couple of T40's lying around, they were great laptops for their day. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#1 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABKJTE6BKYSMLALQQ5TUC5TS5CYGBANCNFSM4VH63KSA> .