Fanless motherboard to build gui-less programmable effects pedal

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I read that on the link that was posted above.

http://wiki.linuxaudio.org/wiki/raspberrypi

It is currently unclear if any USB2 audio interfaces work with the RPi.

Ah, then I need to improve that Wiki page to make clear that the USB controller on the RPi is a USB2.0 one.

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There are a virtually unlimited number of very cheap USB audio 'sticks' on ebay et al that *might* work with the Pi for such a task (I've had this sort of thing in mind for some time too). I have one that cost about £6 and I know the output works at the very least - never tried anything with low latency or input though.

I have a $2 C-Media stick that works really well with the RPi. I'm using it with a system latency below 10ms.

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There are a virtually unlimited number of very cheap USB audio 'sticks' on ebay et al that *might* work with the Pi for such a task (I've had this sort of thing in mind for some time too). I have one that cost about £6 and I know the output works at the very least - never tried anything with low latency or input though.

I have a $2 C-Media stick that works really well with the RPi. I'm using it with a system latency below 10ms.

Wow, look at that little thing!

Problem is the headphone connector puts out a level much hotter than line level, and isn't properly impedance matched to line inputs. And the mic input is a 3 contact with +5V power on the ring (for powering the little preamp in electret condenser mics), and also not impedance matched to line level or instrument (guitar) input levels.

I wonder what electronics it would take to adapt them. Also I'm sure it's 16 bit. I could live with that for some applications, I guess. But I'd far prefer 24.

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Wow, look at that little thing!

Problem is the headphone connector puts out a level much hotter than line level, and isn't properly impedance matched to line inputs. And the mic input is a 3 contact with +5V power on the ring (for powering the little preamp in electret condenser mics), and also not impedance matched to line level or instrument (guitar) input levels.

Good to know, thanks!

I wonder what electronics it would take to adapt them.

I'm very bad with soldering irons, I either burn my fingers or burn holes in stuff. And it's all SMD stuff I guess so no real fun

Also I'm sure it's 16 bit. I could live with that for some applications, I guess. But I'd far prefer 24.

I'm fine with 16bit. And for the money it sounds ok, better than the onboard audio output. Another plus is that it works with JACK which can't be said for the onboard audio output.

Edit:

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ALSA: final selected sample format for playback: 16bit little-endian

So it's indeed 16 bit.