Unable to play back tracks while recording

[Rounan]

Hi,

I am recording using an Edirol AU-25 interface through ALSA - no problems, I can record tracks.
I am playing back using my motherboard's onboard sound - no problems, I can play back tracks.

However, when I try to record a new track while playing back the others, I get an error: Error while opening sound device

The error goes away when I uncheck "Play other tracks while recording new one" under preferences. But then I cannot hear the background I'm recording along with. It's fairly hard to drum to a waveform.

These are physically separate devices. there's no reason Audacity shouldn't be able to play whatever it likes on the output device while recording from the input device. Is there any way to make it do so?

[steve]

I would agree that it "should" work, but even seasoned Linux audio professionals shudder when it comes to sound system problems (mostly thanks to the absence of manufacturers drivers).

Any reason why you can not use the Edirol for playback?

Any reason why you are still using (the ancient) Audacity 1.2 and not 1.3 ?

[Rounan]

I cannot use the Edirol for playback because ALSA does not recognize it as a playback device:

Code: Select all

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC883 Analog [ALC883 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: ALC883 Digital [ALC883 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
$
$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC883 Analog [ALC883 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 2: ALC883 Analog [ALC883 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: U0x46d0x8ad [USB Device 0x46d:0x8ad], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

ALSA -SHOULD- recognize the playback, per the wiki page: http://alsa.opensrc.org/index.php/Edirol_UA-25EX
I am in 44.1kHz, I am aware that in 96kHz the interface is half-duplex only.

I am using Audacity 2.3.5, just realized I posted in the wrong forum. Not familiar with the structure here, sorry. could an admin move this post? I will cross-post later tonight if not.

[steve]

Topic moved (but there is no "2.3.5" so I presume that you mean 1.3.5 )

Shame about not using the Edirol for playback, and I'm afraid I don't now enough about it to help with that issue.

The best solution is obviously to get the Edirol working for both recording and playback (which no doubt you have tried to do). In the mean time, have a look in the Audacity "Help menu > Device Info" and see if your selected devices / sample rates are listed. (I think "Device Info" is available in Audacity 1.3.5)

[Akaash]

yeah I'm having the same problem

[Akaash]

I figured it out (for myself at least), I'm using fast track as my input device, but for the output it should be the same thing. You have to change the output device to ALSA HDA analog connexant and set the rate to 44100 Hz. Worked for me.