From: Jonathan Woithe <jwoithe@ju...> - 2013-11-21 05:19:35
This email includes information forwarded from the web contact form on our
Some background: since FFADO recently gained the ability to work with
AudioFire 8/12 devices with the newer 5.x firmwares, a few users have
noticed that 192 kHz sampling rate is not available any more. It has been
determined by them that this is independent of operating system. That is,
this is not a problem specific to FFADO but is something that the device
itself is enforcing.
Ludovic Ruiz has been in contact with Echo on this subject (thanks Ludovic!)
and has received a reply. The reason why the 192 kHz option was removed in
the more recent firmware was related to unspecified performance limitations
in the chipset. While obviously not ideal, Echo believe that most AudioFire
users have no use for (and do not use) the 192 kHz rate, and personally I
suspect this assertion is correct. As a result, the decision to remove
192 kHz is understandable. There would undoubtedly be some people who need
the 192 kHz operation, and Echo's position is that these users will need to
stick with the 4.8 firmware.
This confirms what was suspected when the loss of 192 kHz operation was
first noticed. It is good to have it confirmed officially though.
A second part of Ludovic's communication with Echo relates to MIDI, and how
MIDI is only workable under FFADO at 1x rates (that is, it is broken at
88.2 kHz and 96 kHz). Echo are doing some tests which will allow us to
conclude whether or not the problem lies solely within FFADO. Once we know
this it is hoped the source of the problem can be identified and fixed.
Thanks again Ludovic for contacting Echo about these issues and for sharing