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The Silonex 'NSL' series are also attracting attention: [http://www.silonex.com/audiohm/index.html Silonex Audiohm Optocouplers]
There are reports of success using the Fairchild H11FxM [http://www.fairchildsemi.com/tree/optoelectronics/solid-state-relay-optocouplers/solid-state-relay/ Solid State Relay Optocoupler] family. These devices use a silicon photo-detector (rather than an LDR), which behaves like an FET, and so they don't suffer from the lag in response that LDR-based devices have, i.e. they can be modulated at audio rates!
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