On Sat, Apr 08, 2006 at 05:17:14PM +0100, James Courtier-Dutton wrote:
  Hi,
 Are there any linux tools out there that will sample the line in, and
 display a detailed spectrum scope of the detected sound?
 E.g.
 
http://www.pcavtech.com/soundcards/ct462048/SNR_LB_FS.gif
 Eventually I wish to send a test signal from one sound card to another
 and compare the frequency response/noise etc. of the line input of the card. 
For 'technical' measurements: JAAA
For 'musical' measurements: JAPA
Both at <http://users.skynet.be/solaris/linuxaudio>
The JAAA release is quite old now and shows it. Improved looks version soon.
Don't forget the shared libs at the bottom of the page.
--
FA
Follie! Follie! Delirio vano e' questo!