Hello,
I don’t know if it’s a problem or just something that is not possible but I give it a try.
I installed Audacity on my macbook pro (10.7.4) and plug my amplifier (Yamaha as-500, line 2 rec) with a regular jack.
I switched the audio port on the mac book to “sound input”, and launched audacity.
Problem, I just have the “built in” input and not the line in (see screenshot)
I tried to “rescan audio device” but nothing changed.
If anyone has an idea, it will be awesome !
Thanks for reading,
Charles
There’s three different variations in Macbooks. The older ones had a real Stereo Line-In like the circle with two black arrows.
http://www.kozco.com/tech/audacity/pix/MacLineIn.jpg
The Macs in the middle had one connection that handles both headphone out and Stereo Line-In and you had to switch it around in System Preferences. The shiny new Macs have no Stereo Line-In. For them we recommend the Behringer UCA202 or equivalent.
http://www.kozco.com/tech/audacity/pix/peaveyUCA202Lenovo.jpg
But yes, it usually shows up as Built-In Line-In or something like that.
You may just be plugged into the wrong hole in the back of the amplifier. I can’t tell what the options are because of poor pictures. Koz
Hi,
Thanks for your answer.
The thing is, it seems to be well plugged :
But in Audacity, I dont have other choice than choosing “Built-in Input” (I should have “Line-in” no ?)
Anyway, when I try to record, I have nothing but a straight line 
Do you have an idea ?
Do you have an idea ?
Yes. It’s not Audacity. Send a scan of the back of the amplifier so we can read it.
You don’t need Audacity to test this. Open Apple > System Preferences > Hardware > Sound> Input and watch the dancing blue sound meter. If you don’t get that, you have zip - nothing.
Koz
That’s what I thought.
I will send you a scan asap.
case closed it was indeed me messing with my amplifier…