Hello!
I recently obtained a BOSS GT-1000CORE [0].
It has the capability to act as a 6-in/6-out USB audio interface. Thankfully, Linux seems to detect it correctly without any configuration, and I see all of the inputs and outputs that I'd expect in Pipewire:
https://ataxia.io7m.com/2023/01/14/pipe.png
Unfortunately, there seems to be some kind of odd distortion. This is a capture of a raw DI signal from the BOSS:
https://ataxia.io7m.com/2023/01/14/noiseissue.flac
There's something odd happening in the high frequency range. It almost sounds a bit like some kind of resampling artifact. The same distortion is not present if I plug headphones directly into the BOSS, so the distortion itself evidently isn't happening on the actual device (or coming out of the guitar pickups!).
Does anyone know what could be causing this and/or how I could track it down?
$ uname -a Linux sunflower.int.arc7.info 6.1.1-arch1-1 #1 SMP PREEMPT_DYNAMIC Wed, 21 Dec 2022 22:27:55 +0000 x86_64 GNU/Linux
[0] https://www.boss.info/uk/products/gt-1000/
On 2023-01-14T13:51:46 +0000 Mark Raynsford list+org.archlinux.proaudio@io7m.com wrote:
Unfortunately, there seems to be some kind of odd distortion. This is a capture of a raw DI signal from the BOSS:
Wow, sorry, disregard this. It turns out the problem was a bad cable between my computer's audio output and my headphones.
On Sat, Jan 14, 2023 at 01:51:46PM +0000, Mark Raynsford wrote:
Unfortunately, there seems to be some kind of odd distortion. This is a capture of a raw DI signal from the BOSS:
https://ataxia.io7m.com/2023/01/14/noiseissue.flac
There's something odd happening in the high frequency range.
Can't hear anything suspect... Also looking at the waveform and spectrum doesn't show any problem.
The problem could be in the playback chain. Do you hear the distortion when playing back the file ? What do you use to record / listen to it ?
It almost sounds a bit like some kind of resampling artifact.
How would that sound ?
Does anyone know what could be causing this and/or how I could track it down?
Try 48000 sample rate. Try using Jack instead of Pipewire.
The 'specs' of the device don't seem to have any meaningful technical content, just marketing blabla. And when I see '32 bit AD/DA', all alarms go off. [1]
[1] For an analog signal to have the S/N ratio that 32 bit (in theory) provides, it would need to have a power of more than one kilowatt.
Ciao,
On 2023-01-14T15:45:16 +0100 Fons Adriaensen fons@linuxaudio.org wrote:
The problem could be in the playback chain.
Yep, this is what the problem was. There was a particular cable extension that I wasn't going through when I was plugging headphones directly into the device. Apparently it just recently went bad.
The 'specs' of the device don't seem to have any meaningful technical content, just marketing blabla. And when I see '32 bit AD/DA', all alarms go off. [1]
Yeah, there's so little information there that I didn't even realize it was capable of acting as an audio interface when I bought it. I fully expected to have to use a separate interface.
arch-proaudio@lists.archlinux.org