Amiga 1200 Rev 1A Distorted Audio Output - Part 2

Here's the same mod file being captured at 0dB after the following motherboard modifications:

R331 changed to 680R
R321 changed to 680R
C331 changed to 6800pF
C321 changed to 6800pF

Gain is slightly reduced but is still very high compared to the A600 and it sounds distorted. It's significantly better than the unmodified board but still not quite right.

I think the gain is definitely reduced as I was able to record at 0dB level without having to heavily attenuate the line input to stop it clipping so badly.

AudioTest

Using the Amiga 1kHz Audio Test program (copy available here AudioTest.lha), here's the audio capture at 0dB from both the A600 and A1200 for comparison.  This is the 1kHz tone at maximum volume output with the filter turned off.  The difference in output level is clear to see.

I'll follow up with Part 3 after I've done some more troubleshooting.  I'm not done yet!