improvement in audio

[jsmolina]

Hi,
I did an audio improvement for the mister fpga core,
not sure if it's from your interest
https://github.com/MiSTer-devel/MacPlus_MiSTer

now lode runner sounds flawlessly running on slow cpu mode.
@gyurco

[gyurco]

Thanks, I'll look at it. Actually I didn't notice audio distortions, but maybe I just don't know how should it sound originally.

[jsmolina]

reproducing:

play lode runner,
laser sounds sound better
and, also, at the end of each level you'll hear a music. It should sound warm, but it sounds like harsh without this change.

(at low cpu mhz)