This is a -trying to be simple- tutorial, based on my experience, on audio recording with Yamaha MW8CX & Ardour in Ubuntu 9.10 a.k.a. “Karmic Koala”…
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1. Open Synaptic Package Manager
Search and install : jackd (JACK Audio Connection Kit) and ardour (Digital Audio Workstation).
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2. Connect Yamaha mw8cx via USB (check with lsusb from Terminal)
See “Texas Instruments Japan PCM2900 Audio Codec”? That’s our mixer-audio interface…. It’s connected succesfully.
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3. Open Terminal -> gstreamer-properties
There’s some differences on handling audio devices and properties in this version of Ubuntu. You no longer able to manage them in one feature called “sound preferences”. Instead, to manage whether you want to use ALSA, OSS, PulseAudio, etc. you have to open the terminal and type “gstreamer-properties”. A window called Multimedia Systems Selector will appear.

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4. Audio tab -> Output : ALSA, default ; Input : ALSA, USB Audio
Make the settings audio tab like the picture above. Note : Sometimes “USB Audio” disappeared (any idea guys??). If it happens, just choose “default”. Ok, close this when you’re done. “But the test won’t work?” (Either no sound or error message appeared), don’t worry, just go to the next step.
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5. System -> Preferences -> Sound
Input Tab -> Device : PCM2900 Audio Codec Analog Stereo,
Output tab-> Device : PCM2900 Audio Codec Analog Stereo
Now open Sound Preferences, and do these settings :
And the output tab :
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6. Run Ardour and JACK
Now, run Ardour. But not so fast, do these settings (make sure the driver and interface are correct. sample rate, buffer etc. are up to you) and then open JACK (no need to press “start”, just run this app).
Ok, now you’re ready to make a new session or open existing session.
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7. Enter Ardour
Now we’re ready to record something. Add track on the left side, right click on the blank area below “master”.
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8. Start Recording
After adding a track (and preparing your input on Yamaha MW8CX; it can be keyboard, mic, etc.), now let’s record something.
Now, let’s see…
First, press the record button on the track channel on the left.
Second, press the record button on the top (it will blink).
Last, press play
now the recording starts. To stop it, just press space or play…
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Have fun guys! One more thing : to normalize, just select the audio part and press ‘N’.
Any ideas or further explanation about this (or… about MIDI in Ubuntu) are very welcome… I need them too.