Hall effect sensor

[jjj]

I found a simple hall effect application. Is that what I could use to control the PC soundcard's stereo output volume via a DIY breath controller to add tremolo and/or volume changes?

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Not quite sure how it works. As far I discovered it works with moving a little magnet to the hall effect sensor or visa versa. How do I connect the soundcard's outputs to it? Finally, how to make it work logarithmically?
Since I need only to control the soundcard's stereo output, I'm glad not to bother with MIDI control and that surely makes it less problematic.

 

[Super_voip]

for breath control maybe you should look at something that is temperature sensitive. A Thermistor is a temperature variable resistor and may suit your needs better.

 

[tytower]

My use of hall effect sensors have been for measurement of revolutions .When a magnet is passed by the sensor a pulse is emitted . Those pulses are cleaned up and passed to a counter circuit and then to a display which when calibrated then gives the rpm

How were you thinking of using these sensors ? Look to the bottom of this screen for similar threads .There are quite a few