As always, nice job.
I have a question or request.
Please tell us more about the setup of the EMU mixer software. Are there different settings for 44.1K 48K 96K and 192 K and 16 bit or 24 bit in the mixer software?
I have an EMU 1212, sorting out the mixer software looks to be a long rainy day project.
On the EMU0404 USB control panel is possible set only the sample rate and it must be set to 192KHz to have the larger frequency response band.
In my webpage there is an image about the EMU0404 USB control panel.
No mixer software is available with EMU0404 USB.
Could you send me an image of your mixer ?
Very interesting... I am about to build this:
Your PC as an Audio Analyzer: Measure THD, S/N, Power Output, etc
Don't know if it works ok though.
If the diodes have a fault these will be open for the signal so does not protect your sound card.
It is necessary a resistance before the diodes to protect these.
The 100K before the sound card introduce with the input capacitor of sound card a filter on high frequency limiting the band.