patching synthesizer to sound card

[Janina Sajka]

Pops aren't explained by impedence. Neither is a noisy background in the
signal.

The pops themselves are exactly the kind of pop you get by going from 0
to full volume instantly in a voltage gate. Maybe some of you folks
might know about that? On the other hand, ramping the signal up quickly
would avoid that kind of pop entirely.

For the record, line level impedence is 500 ohms, and headphone
impedence is 8 ohms. So, plugging your headphone into the line output
will get you hardly any volume. Plugging a headphone output into a line
on a mixer will work, but you have to be very careful to keep the volume
extremely low, as the signalo is very hot that way. Generally, this
isn't recommended, of course.

Scott Howell writes:
> Actually I've spent a great deal of time with this problem and have yet 
> to find a solution. Regardless of what I've done in terms of volume or 
> input on a mixing board, I've not found anything that worked well. It 
> was as Janina said about pops and distortion to even virtually no 
> volume. I've offten thought maybe it had to do with the impedence of the 
> Doubletalks, but not to sure. They generally are configured in such a 
> way to work with headphones and small speakers and there even with 
> speakers you have to be careful. I can't recall what the impedence is on 
> a walkman type headphone, but I imagine its nowhere what most inputs are 
> on sound cards nor mixing boards.
> I also believe that if its impedence, getting a device to change this 
> would be expensive. I remember the transformers for microphones when I 
> was playing in a band to go from low to high impedence were not cheap.
> 
> 
> 
> On Sun, Feb 16, 2003 at 05:18:03PM -0600, Gregory Nowak wrote:
> > If you would have lowered the volume on the synth, you probably would have gotten a better signal as a result.
> > 
> > Greg
> > 
> 
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-- 
	
				Janina Sajka, Director
				Technology Research and Development
				Governmental Relations Group
				American Foundation for the Blind (AFB)

Email: janina at afb.net		Phone: (202) 408-8175