Asynchronous Duplex bug: hardware or driver?

[squidbidness]

I just read the pinned topic about asynchronous duplex audio being a know bug with the Octo sound card. Is this a limitation of the actual hardware, or would resolving this be a matter of updating the driver or the Linux kernel?

I'm not sure if this would be an issue for me or not with what I have in mind for this board: I'm considering buying one to use as the controller of a custom multi-effects pedal for guitar. The basic concept is that I'll be using Jack to chain the audio through a small number of programs (maybe even only one or two: an audio plugin graph/pedalboard simulator such as Carla or mod-app from the Mod Duo's interface). I don't know enough to tell if such a setup would require asynchronous duplex mode or not. My hope, of course, is that Jack will just open the device in synchronous duplex mode and manage that itself, so the client programs won't worry about it.

Does someone here have enough knowledge to answer whether such a setup is likely to even run into the asynchronous duplex mode?

[flatmax]

HI there,

Your project sounds great - Live performance effects unit - nice !

If you plan to use jackd you wont face any problems. The asynchronous bug occurs when you open the ALSA playback device and then open the ALSA capture device independently at some time in the future. The same happens if you open the capture device first and at some arbitrary time in the future you open the playback device.

jackd opens both capture and playback at the same time - so you are safe - it is synchronous.

Matt

[squidbidness]

Okay, that's good news that Jack uses the device synchronously.

I am still curious if the issue with asynchronous usage is a hardware limitation of the Audio Injector, or a configuration or driver issue.