typo
Merge branch 'alla-cieca' of github.com:radiocicletta/vlevel into alla-cieca

Conflicts:
	vlevel-jack/vlevel-bin.cpp
Merge branch 'alla-cieca' of github.com:radiocicletta/vlevel into alla-cieca

Conflicts:
	vlevel-jack/vlevel-bin.cpp
welcome back, --length option
now the default value is 512 samples