I'm building a suitcase controller / live rig using an Atom 550, Ubuntu 10.10 x86_64, Native Instruments Audio2DJ, Fatar TP80 waterfall keyboard.

Wow...looks heavy, but nice work!

What does any other audio software in Linux show you? If other software shows you the same configuration then it is Linux itself (i.e. recognition of the audio hardware).

[edit]

Sorry, I just re-read you post and you mention the ALSA config...

In terms of the default outputs I believe you have to set that in the ALSA configuration file...it doesn't remember by just selecting it in the ALSA gui.

JR

I don't use pianoteq with ALSA due to latency issues so I normally use JACK.  However, I just tried using ALSA to select additional channels but ran into some difficulties.

Alsa shows my sound card with 6 possible outputs and defaults to using channels one and two.  If I try to check Channel 3 or Channel 5 then Pianoteq unselects the entire audio device.  If I check 4 before trying to check 3 then I can select the four channels and it tends to stick when reloading.  Now, I'm not sure if this is a bug in Pianoteq or if this just has to do with my particular card but I figured I would post this here (tested on 3.6.6 20110117)

Selecting a bunch out of sequence (don't recall exactly as I was just playing around) and as I selected the final channel it unselected channel 1 which I thought was pretty strange as well so maybe the channel selection with ALSA is actually buggy.  Maybe a few other users can check it out.

I'm building a suitcase controller / live rig using an Atom 550, Ubuntu 10.10 x86_64, Native Instruments Audio2DJ, Fatar TP80 waterfall keyboard. The rig is designed to be used headless (no monitor) and will use midi automation to control Pianoteq.  With this setup I'm getting a performance index of 13-14.

The only issue I've run into is in utilizing all 4 channels of the Audio2Dj, a 2 subdevice, low latency usb audio interface. Pianoteq will only list the first available subdevice in the Alsa config, whereas on my MacBook, Pianoteq lists all 4 channels for the Audio2Dj (not a fair audio subsystem comparison, I know).

Here is what 'aplay -l' tells me

card 2: Audio2DJ [Audio 2 DJ], device 0: Audio 2 DJ [Audio 2 DJ]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1

I've tried creating virtual alsa devices that included all 4 channels, but Pianoteq will still only list the first available subdevice.

I have been able to route to all 4 channels using Jack, but Jack can be unstable and my attempts at automating channel routing post launch of Pianoteq were not rock solid - there are too many things that can go wrong in a headless environment.  I've also had Jack crash on me many a time - it is not as stable as Pianoteq IMHO.

Does anyone know of any tricks to get Pianoteq to list all Alsa subdevices? That way I could select all 4 channels, save my configuration and leave it.

Thanks,
Patrick