Yamaha VL1 Owner's Manual page 12

In all these
instruments
pressure
applied here
(the driving
point) causes
vibration which
results in
sound.
The sound thus
produced is amplified
and sustained
by the body of
the instrument.
One of the remarkable features of the VL1's Virtual Acoustic Synthesis
system is that just about any driver can be used with any type of pipe or string.
Drivers
Getting Started
Reed vibration.
Lip vibration.
Air vibration.
String vibration.
The pitch of the sound is determined
by the length of the air column or
string, and the timbre is a complex
product of the driving source (reed,
lip, air, string), the shape of the
resonant cavity, the materials from
which the instrument is made, etc.
11
Pipes/String