Thanks for the reply.
The relays will be controlled either by a Altera EPM7064 or by a microcontroller (PIC16F84) which counts pulses and senses rotation of an optical encoder. I haven't decided yet. I will buy an Altera EPM7064 next week, If I find it usefull I will use it, otherwise I will go for the PIC16F84. I have never tried the EPM7064 before...
So if I need an attenuation of -48dB only one resistor will be in the signal way. An attenuation of 60dB would mean that two resistors are in the signal way. Max attenuation is 94,5dB (six resistor in the signal way).
As for the transient when switching, I think the relays are fast enough so there won't be any audible click/pop when changing volume setting. I use relays for switching between different sources on my preamp, and there is no audible pop or click.
As for the remote controll, I will use Holtek HT12-D and HT12-E chips to make a simple transmitter/receiver.
More info about the Holtek chip can be found here.
http://www.holtek.com/
Here's a schematic for a receiver/transmitter using the above mentioned ICs.
http://www.rentron.com/project03.htm
I'm a little unsure about the the crossover frequency I should use for filtering. The filter in the schematic is a Bessel 60kHz 12dB/octave. Perhaps I should use a lower crossover frequency?
/Freddie