[PD] RPI stereo USB audio was: audio interface with multiple ins on raspberry pi

[Christof Ressi]

> but I require XML
In my experience, XML works just fine on all Raspberry Pi models :-p

On 07.10.2020 17:06, Dan Wilcox wrote:
> Yeah, I know a lot of these small mini-jack boards work, but I require 
> XML and jack inputs and stereo jack outputs.
>
>> On Oct 7, 2020, at 4:58 PM, Antoine Rousseau <antoine at metalu.net 
>> <mailto:antoine at metalu.net>> wrote:
>>
>> I've never had much trouble (rpi2/3/3b/3b+/4...)  with this kind of 
>> thing:
>> https://www.gotronic.fr/art-adaptateur-audio-usb-21834.htm (warning: 
>> unfortunately mono input only)
>> I could run full-duplex Pd at less than 10ms latency (of course it 
>> depends on your actual patch).
>>
>> However older (while more expensive) boards (like Alesis io4) have 
>> sometimes been a lot trickier!
>>
>> So it seems to me that it depends more on the audio device than on 
>> the computer model.
>>
>>
>> Le mer. 7 oct. 2020 à 15:58, Dan Wilcox <danomatika at gmail.com 
>> <mailto:danomatika at gmail.com>> a écrit :
>>
>>     Thanks Josh, good to know. Now that the RPI 4 has a controller
>>     chip, I should probably try one again.
>>
>>     I had some success for a project using a quad-core Udoo board
>>     circa 2013 but it was also more expensive than the Pis at that
>>     time and a bit overkill. It *did* however have a USB controller chip.
>>
>>>     On Oct 7, 2020, at 3:42 PM, Josh Moore <kh405.7h30ry at gmail.com
>>>     <mailto:kh405.7h30ry at gmail.com>> wrote:
>>>
>>>     The Pi 2 and 3's usb were very much hacks due to the limitations
>>>     of the Broadcom chip. It's fixed in the Pi4. See here for info:
>>>     https://www.raspberrypi.org/documentation/hardware/raspberrypi/usb/README.md
>>>
>>>
>>>
>>>
>>>
>>>     On Wed, Oct 7, 2020 at 5:18 AM Dan Wilcox <danomatika at gmail.com
>>>     <mailto:danomatika at gmail.com>> wrote:
>>>
>>>         To add on to Chris's question with a tangent, have any of
>>>         you had good experience with bog-standard stereo USB Audio
>>>         interfaces and RPI 3 or 4?
>>>
>>>         Some years ago now, I tried to use an RPI 2 with my trusty
>>>         USB 1.1 standard audio interface (Roland Edirol UA-25) which
>>>         is full-duplex stereo, 2 in / 2 out. I could never get it to
>>>         work well in full-duplex mode without dropouts, even with a
>>>         low-latency kernel and other real-time tweaks. In the end,
>>>         it seemed the USB driver on the RPI was simply not designed
>>>         for the "isynchronous audio" this requires.
>>>
>>>         The same device worked well on my original wearable, a
>>>         Pentium 3 500 MHz machine but with a dedicated USB
>>>         controller chip.
>>>
>>>         In the end, I decided to move toward iOS for
>>>         embedded/wearable (hence PdParty) and the same device works
>>>         very well at low-latencies on iPads and my (now old) iPhone 5S.
>>>
>>>         I'd like to still be able to run the setup with alternate
>>>         systems, so does anyone have experience that the USB drivers
>>>         have been improved? Thanks in advance
>>>
>>>>         On Oct 6, 2020, at 12:00 PM, pd-list-request at lists.iem.at
>>>>         <mailto:pd-list-request at lists.iem.at> wrote:
>>>>
>>>>         Date: Tue, 6 Oct 2020 10:48:48 +0800
>>>>         From: Chris McCormick <chris at mccormick.cx
>>>>         <mailto:chris at mccormick.cx>>
>>>>         To: PD List <pd-list at iem.at <mailto:pd-list at iem.at>>
>>>>         Subject: [PD] audio interface with multiple ins on raspberry pi
>>>>         Message-ID:
>>>>         <5f3198d4-6210-4b41-d3a6-2cccbd3aae0a at mccormick.cx
>>>>         <mailto:5f3198d4-6210-4b41-d3a6-2cccbd3aae0a at mccormick.cx>>
>>>>         Content-Type: text/plain; charset=utf-8; format=flowed
>>>>
>>>>         Hey all,
>>>>
>>>>         Same question as the previous poster but I was wondering
>>>>         about inputs
>>>>         rather than outputs. Ideal solution:
>>>>
>>>>          * USB.
>>>>          * Low cost.
>>>>          * More than 2 channels in.
>>>>          * Headphone sized jacks.
>>>>          * Works with Raspberry Pi.
>>>>
>>>>         I've searched but could not find such a beast. Any hints?
>>>>
>>>>         Cheers,
>>>>
>>>>         Chris.
>>>
>>>         --------
>>>         Dan Wilcox
>>>         @danomatika <http://twitter.com/danomatika>
>>>         danomatika.com <http://danomatika.com/>
>>>         robotcowboy.com <http://robotcowboy.com/>
>>>
>>>
>>>
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>>
>>     --------
>>     Dan Wilcox
>>     @danomatika <http://twitter.com/danomatika>
>>     danomatika.com <http://danomatika.com/>
>>     robotcowboy.com <http://robotcowboy.com/>
>>
>>
>>
>>     _______________________________________________
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>
> --------
> Dan Wilcox
> @danomatika <http://twitter.com/danomatika>
> danomatika.com <http://danomatika.com>
> robotcowboy.com <http://robotcowboy.com>
>
>
>
>
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