MOTM

Adam Schabtach writes:
>>Yup, an excellent technique. You can also synthesize frequency sweeps in the 
computer and use those as the test signal. There is a freeware program called 
MakeATestTone which generates AIFF files of frequency sweeps of whatever 
duration, range, and amplitude you want. Play the test tone out through one 
channel of your audio interface and record the output of the device through an 
other channel.<<

Yes, that sounds just like a freeware program I tried, but there were so many 
problems. Just listening by ear I could tell by the changing timbre and hollow 
sound of the swept sinewave that it was generating other harmonics. Can't get a 
pure sinewave out of this computer. The input back into the computer was so 
weak no matter what I tried, the plot was almost non-existant and kind of 
sloppy looking anyway. And it only plotted on a linear scale, not log scale.  
That's why I dropped that method and turned my Nord Mod into a sweep generator.

>>I suppose the first thing one should do when employing this technique is to
loop the test tone output straight back into the recording input, so as to
measure the frequency response of your audio interface.<<

And I forgot about this one. When doing that, one should get a straight line, 
but I was getting all kinds of bumps and ripples so any plot wasn't accurate 
anyway.

-Elhardt