[sdiy] Audio mixers

[David G Dixon]

> i noticed this on the TL072 on his page
> 
> "The JFET input devices give their best noise performance at medium
> impedances, in the range 1K - 10K."
> 
> so does this meant most synth modules are pushing them into Noisy
> operation since most of us use 100k inputs on our summers?

Yes, I think that's exactly what it means.  That's why I've taken to using
100k for CV applications, and 10k for audio applications.  Also, I've found
that high impedances create more problems on surface-mount boards than on
through-hole boards.