MISC: Minor comment fix

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
SYNTH: Fixed mismatch between function declaration & definition

The return type was not properly updated as unsigned in the .cc file.

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
SCRIPTS: Removed trailing space

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
SCRIPTS: Added prototyping scripts for envelop generator

Also added a prototyping script for an ADSD implementation.

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