[sdiy] clickless muting

[Neil Johnson]

Tom,

> I wouldn't say there's any problem with running audio through a panel switch, but it won't get you anywhere close to silent switches, and I'd avoid relays for the same reason. Anything with bouncy bits of metal banging together.

Look up Teledyne relays, and mercury-wetted relay technology.  Used
extensively in RF and ATE.  As always, quality costs.

Irrespective of any mechanical issues, relays will "click" in the
audio path simply due to the abrupt change in amplitude.  They were OK
for PFL switching in older desks before FET switches became cheap
enough.  The late Jim Williams recommended them for wideband precision
switching when multiplexers and OTAs and other analogue trickery just
won't cut it.

Oh, and David, Teledyne will send you S parameters of their relays if you ask.

Neil
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