Bob Hartmann wrote:
> -M-audio MidiSport 4x4 USB and M-audio Mobile Duo (USB)
>
> So there are 2 ALSA devices with the same name.

They should have different names.  What does /proc/asound/cards say?

> Alsaplayer will play midi files but not CDs.

It assumes that the audio output of the CD drive is connected to the
line input of the sound card.

> The 2 USB devices give me 'no mixer elems found' I've read that
> neither have a hardware audio mixer, so what do I use instead?

The MidiSport just sends MIDI data to other devices; it's the
synthesizer that would have a volume control.

The Duo indeed doesn't have a volume control.  You'd have to scale the
audio data before sending it to the device.  (Some future version of
ALSA may be able to do this.)

> It would seem that c 0 is the MIDI controller, c 1 is the
> on-board, and c 2 is the USB Audio Duo (the one I want to use for
> RoseGarden, Audacity, whatever..)

You can change the order with some entries in module.conf.  For
example, if your cards should be 0:Duo, 1:4x4, 2:onboard, use:

options snd-usb-audio index=0,1 pid=0x____,0x1021
options snd-ens1371 index=2

where ____ is the product ID of the Duo (see lsusb).

You can change the order by changing the index parameters.


HTH
Clemens




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