SCRIPTS: Fix minor style changes in Moog base lowpass filter

This makes it cleaner.

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
SCRIPTS: Add a complete Moog filter prototype

This is still a prototype - no oversampling and various non-linearities
in the output.
Fixes #3

Signed-off-by: Gama <misept.dieseneuf@gmail.com>