Hey list, Thanks for your prompt replies and helpfulness!
I could not get qjackctl to work, the audio will not go through and the PD CPU load gets abnormally high at around 67%... I had already played with the sample rate and I had noticed that augmenting the frequency yields better results but the noise was still very present. The sound card itself works correctly with Audacity so I am sure it would work with the arecord and aplay commands Brian suggested. Weirdly, it is only with PD that it is struggling... On a more encouraging note, as Brian suggested, it seems that the problem (or one possibility) is the duplex audio. I haven't thought about using the card as an output only device before and it did work! But afterwards, I was not able to change the settings back and use the noisy duplex audio any more, I was only able to switch the output devices... @Brian: What type of software are you using for the signal processing with the Raspberry Pi? I am very curious because I had first attempted to build this project on a BeagleBone Black but the heavy PD patches made it unstable or crash... On Sat, Apr 5, 2014 at 12:16 PM, Brian Fay <ovaltinevor...@gmail.com> wrote: > If you haven't tried it already, try increasing the latency in the audio > settings (probably not the issue, but worth a shot). > > Maybe it's only having trouble with duplex audio (simultaneous input and > output). Do you have both input and output enabled for your soundcard? Does > it work if you only have the output device set, and leave the input device > blank? > > You can test to see if duplex audio is working outside of pd - try running > "arecord | aplay" (the vertical bar means pipe the data from arecord into > aplay), and see if you get usable sound. You may need to set some command > line flags on those to get the sample rate and audio devices right, sorry I > don't know them offhand. > > I am running a fairly similar setup - for an honors project at my > university, I'm using a Raspberry Pi and Behringer UCG102. I have a nice > multi-effects pedal working at less than 20ms latency. If my Raspberry Pi > can handle it, I feel like your UDOO quad should definitely be able to. I'd > like to add that you have a nice taste in projects :) > > > On Fri, Apr 4, 2014 at 10:41 AM, Carlos Sanchez <csanchez...@gmail.com>wrote: > >> Yes, I have tried changing sample rates and it has not solved the issue. >> >> The sound card I am using is basically a copy of the Behringer UCG102 >> guitar to USB interface : >> http://www.behringer.com/EN/Products/UCG102.aspx >> >> >> >> On Fri, Apr 4, 2014 at 8:40 AM, tim vets <timv...@gmail.com> wrote: >> >>> and what is this 'Generic Guitar to USB' exactly? >>> >>> >>> >>> 2014-04-04 3:09 GMT+02:00 Carlos Sanchez <csanchez...@gmail.com>: >>> >>>> Hello PD-list, >>>> >>>> I am currently working on my semester project which is a guitar >>>> multi-effect pedal using the UDOO Quad and PD. I got everything up and >>>> running on the Linaro Ubutu 12.04 LTS build provided by UDOO and I am >>>> having strange results with PD. The soundcard I am using works normally >>>> when I am using Audacity. It plays wav files and can record the guitar >>>> signal correctly but when it comes to PD, a basic osc object or a table >>>> read through ALSA produces a strange digital noise, completely ruining the >>>> audio signal. >>>> >>>> I have also tested this setup with a M-Audio Fast Track Pro USB card >>>> and the playback worked without issues, although I could not get the input >>>> signal through the adc object for an unknown reason. >>>> >>>> Has anyone tried a similar setup for guitar usage? >>>> >>>> Thanks! >>>> >>>> _______________________________________________ >>>> Pd-list@iem.at mailing list >>>> UNSUBSCRIBE and account-management -> >>>> http://lists.puredata.info/listinfo/pd-list >>>> >>>> >>> >> >> _______________________________________________ >> Pd-list@iem.at mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list >> >> >
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