I worked in the PCB industry for many years. There are many variables that each manufacturer uses in their construction process of their PCBs that vary considerably. Some Printed Circuit boards can be very quiet, and have decent sound, but in many cases this is not so. That green stuff on them is called "solder mask". (It is the insulating material that is used to cover the exposed traces). The sonic degridation of the solder mask alone makes it worthwhile to consider point to point wiring as an alternative. Generally the sound will be more open and less strident, sort of like the difference between an average interconnect and a real good one. In the end, the reason most manufacturers use circuit boards is to streamline their manufacturing operations, lower labor costs and save money.