I think I’m making progress...?
I really appreciate everyone’s help on this, I’d be lost.
I’ve capture some audio for comparison (Elevator Action track 1CC). You can listen here:
https://m.soundcloud.com/everten2/sets/taito-f3-audio
There are 3 tracks.
- Line level
- Attenuated level
- Line level raised to match attenuated level (this is quality comparison)
I’ve got the levels in a good place now. Someone who knows better can chime in about the resistor values I ended up with and if it’s acceptable. I tested several and this produced best results.
Levels compared:
Here’s the circuit I used, ground to the heat sink as suggested: