Schwerlasttransport by 505 missing LMC1992 effects

[evldhs]

This is a big one to fix :) Not a bug but a missing feature; LMC1992 filters.

Here's a brand new track from 505 using it:
https://sndh.atari.org/?ID=6136

[frno7]

Thanks for the report, @evldhs! Nice test case. I’ll note the relation to issue #9.