Hi Guys!

Basic question:
I am running the 8741 Opus in hardware mode. For some recordings I would like to be able to switch from filter #2 to filter #3 using an external switch. ...in other words, change the state of FSEL from "+" to "0". Could you please explain how to do this using the I/O header? [I presume that '+' on the Opus state switch = 'Z' on the WM8741 data sheet...] Thanks!

Rationale:
I generally prefer my music at 'performance levels'. Unfortunately, my listening room has marginal acoustics (square and not very absorptive) so my powerful midrange speakers can easily produce harshness when recordings include significant overtones. Played through the Opus, the recordings that tend to be strident are more enjoyable using filter #3 (hardware mode: OSR = '+', FSEL = '0'). However, sweeter, better recordings are much more life-like using filter #2 (OSR and FSEL = '+'). For example, using filter #2 saxophones seem absolutely live and fine acoustic instruments (especially violins and cellos) sound much more genuine. It would be wonderful to toggle the DAC filter depending on the recording and/or desired output level. I would normally glue egg cartons to the ceiling and walls but for reasons I don't understand my wife objects to that solution!

Your help will be much appreciated!

Frank