8 Jan
2017
8 Jan
'17
11:29 p.m.
On Sun, 8 Jan 2017 23:06:54 +0100
Ralf Mardorf <ralf.mardorf(a)alice-dsl.net> wrote:
I'm referring to the ALSA mixer control, which goes up to +6db.
On Sun, 8 Jan 2017 21:25:35 +0100, Johannes Kroll
wrote:
OK. Would still be interested in the comparison recordings you
mentioned.
...which would mean that you if you listen to an
input, you mix it with
a copy of itself delayed by the buffer size. That would definately
sound weird, and could explain Ralf's experience.
No, since on Linux I used Ardour and directly connected the stereo
track's outputs by jackd to playback_n. I didn't test any of the
18i20's inputs. That's
definately an issue with my 18i8 first-gen as well. When I set
an output control to more than 0db, the output doesn't clip -- it
integer-wraps, which causes really evil distortion. I confirmed that
with an oscilloscope. I'm not sure whether this is a Linux driver
issue, or bad design. It shouldn't be possible to turn volume up beyond
the 0db setting if that causes such distortion.
0 dB related to what? The audio files were played
with an output
< 0 dBFS and perhaps at max. 0 dBFS here. Does the Focusrite
mixer
control the analog domain? Does it increase a digital signal that comes
from the DAW by the digital domain? On Sun, 8 Jan 2017 21:46:40 +0100, Johannes Kroll
wrote:
I've used the Scarlett on a stock Ubuntu kernel, Mint kernel, and the
AVL RT kernels. Mixer controls work on all of them, so I assumed the
patch would be in mainline by now.
You can try applying this patch:
https://github.com/smilingthax/alsa-driver_scarlett/tree/patches
First, look here:
https://github.com/smilingthax/alsa-driver_scarlett/commit/7a77707b66ee476d…
(This patch is now inside the mainline kernel; I did not write it)
It's neither part of the latest kernel supported by the rt project, nor
by the current mainline rc, https://www.kernel.org/ :