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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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, [email protected] wrote: >> >> Date: Tue, 6 Oct 2020 10:48:48 +0800 >> From: Chris McCormick <[email protected]> >> To: PD List <[email protected]> >> Subject: [PD] audio interface with multiple ins on raspberry pi >> Message-ID: <[email protected]> >> 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 >> robotcowboy.com >> >> >> >> _______________________________________________ >> [email protected] mailing list >> UNSUBSCRIBE and account-management -> >> https://lists.puredata.info/listinfo/pd-list >> > > -------- > Dan Wilcox > @danomatika <http://twitter.com/danomatika> > danomatika.com > robotcowboy.com > > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > https://lists.puredata.info/listinfo/pd-list >
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