iCMOS analog switches and multiplexers
I've used the ADG1401/ADG1402 and the ADG1419 pretty extensively without issues.

The one thing that would give me pause in your application is that the resistance of the iCMOS switches is non-linear with voltage. While I wouldn't worry about using perhaps one or two switches, stringing a lot of them in series could produce some interesting voltage-dependent non-linearities.



With a non-linearity of ~0.5Ω per switch, eight switches would vary ~4Ω across the input voltage range. If the load you're driving is 100KΩ+, it shouldn't be a problem (though some crazy audiophiles will probably disagree).

Realistically, why do you have eight switching elements in the signal path? If I were you, I would try to use fewer larger multiplexers. Analog Devices make 8:1 and 16:1 multiplexers. They have higher on-resistance, but since you have fewer devices, it would balance out.