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Disappearing Wave Form

Hi there;

I tried to use Garageband on my Macbook Pro to record a live show this weekend and failed magnificently. Running a 1/4" from the main outs on a Mackie mixing board, into my audio interface (Motu Ultralite), where I got a great signal, I then armed a "no effects" track, selected the corresponding input source and voila!

It worked at first, recording a chunk of the opening act. But then, when I tried again for the headliner, the wave form which seemed perfect in the recording process, disappeared as soon as I stopped the recording.

I should say I encountered a number of errors between takes, that the disk was running too slow. This surprised me, considering my beloved machine is a monster with a 2.8 GHz processor and 4GB memory.

Do you think it's a bug or is GB not equipped to handle a live signal?

Thanks in advance for your feedback.

Macbook Pro, Mac OS X (10.5.8), 2.8 GHz Intel Core 2 Duo, 4 GB Memory, 800 GB HD

Posted on Apr 12, 2010 2:44 PM

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6 replies

Apr 14, 2010 1:05 PM in response to tokopa

There shouldn't be anything inherently wrong with using GB to record live.

And you are only running one stereo track.

If using a notebook it's a good idea to stream to an external FW800 7200 rpm drive with a decent size buffer.

Can't tell from your post if you were using the internal drive or not. If so, I assume it would be a 5400 rpm and perhaps what your issue was.

Apr 14, 2010 1:59 PM in response to Christoph Drösser

Christoph Drösser wrote:
I would never use GB to make a critical recording


^^ That is an amazing statement.

Its true that GB is buggy. Sometimes it doesn't do what it is supposed to do. I have lost the odd recording in a similar way as the OP described. Its a shame that the developers do not stay on top of such a great little program... after all, it should "Just Work."

I would be surprised that recording to a 5400rpm system hard drive was the issue. Bench marking tools on other systems have highlighted the fact that average read write speeds to external 7200rpm drives using FW400 are slower than to 5200rpm internal system drives because of the interface connection and bus speeds. I would love to see info to the contrary though.

Because I have lost material in the past when recording audio I have learned to always 'test' the current GB project by making two 'junk' recordings. This is simply a few seconds of recording whatever. Make one, stop, then make another on the same track from where you left off. If the first snippit disappears then discard, quite GB, open another project and test again. This has ALWAYS worked for me.

Disappearing Wave Form

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