In an ideal world all analogue audio interconnections would be balanced using XLR connectors. It is not an ideal world as you may have noticed.
When tackling the problem of semi-professional, consumer and downright amateurish audio equipment brought in to a professional environment it is advisable to try to get it to look as ideal as possible. Some equipment will require a line interface, but a lot can be handled with some simple, but correctly wired adapters.
This section has a range of adapter cables for common interfacing requirements to semi-professional equipment.