[Mike Rivers]

On 2/8/2011 8:29 PM, mcp6453 wrote:

I ran Tip/Ring of the plug connected to the insert on channel 1 to Pin 2 and
Sleeve to Pins 1 and 3. For some reason that I don't understand, the loading
problem appears to have been solved. The mic preamp is not loaded such that it
distorts.

I can understand that. You removed Pin 3 from the signal
source, and apparently Pin 3 on the Delta 1010LT is nearly
ground.

The exercise has uncovered another issue. The Delta card and my M-Audio
Audiophile 2496 in a different computer have a lot of digital noise in the
playback.

Both computers, each with its own, different, sound card
have the same kind of noise? Is that "digital noise"
crackles, pops, and skips/mutes? Or is it hums and buzzes?
Is the noise in playback no matter what the source, or
only when you play back a recording that you made? Do you
get the same kind of noise when you play back a downloaded
or streaming audio file?

If you could post a short example of something you've
recorded where it could be downloaded, someone could check
your recording and see if that's where the problem lies.

Do you have something connected to the computer that might
be causing a problem with noise on the ground? This may not
be obvious. For example, if you have a TV set which is
connected to cable also connected to the computer so you can
play the computer into the TV set? TV cable is, or at least
used to be, a well known noise source.


--
"Today's production equipment is IT based and cannot be
operated without a passing knowledge of computing, although
it seems that it can be operated without a passing knowledge
of audio." - John Watkinson

http://mikeriversaudio.wordpress.com - useful and
interesting audio stuff