local_transport (default: local:$myhostname)
This is the default for final delivery to domains
listed with mydestination, and for [ipaddress] des-
tinations that match $inet_interfaces or
$proxy_interfaces. The default nexthop destination
is the MTA hostname.
virtual_transport (default: virtual:)
This is the default for final delivery to domains
listed with virtual_mailbox_domains. The default
nexthop destination is the recipient domain.
relay_transport (default: relay:)
This is the default for remote delivery to domains
listed with relay_domains. In order of decreasing
precedence, the nexthop destination is taken from
relay_transport, sender_dependent_relayhost_maps,
relayhost, or from the recipient domain.
default_transport (default: smtp:)
This is the default for remote delivery to other
destinations. In order of decreasing precedence,
the nexthop destination is taken from sender_depen-
dent_default_transport_maps, default_transport,
sender_dependent_relayhost_maps, relayhost, or from
the recipient domain.
Восьмибитная музыка отличается от невосьмибитной, грубо говоря звучанием сэмплов, в остальном подход точно тот же, что и с любой другой музыкой - js здесь совсем не помощник.
Желаю удачи в начинании. :) Попробуйте начать с Фрукта, он довольно прост в освоении.