LinPlug Organ 3 - Manual (Page 46)

The Scala home page is http://www.xs4all.nl/~huygensf/scala/
Specifying the Reference Frequency of a Microtuning
One of the powerful capabilities of the TUN file format and Scala, is the
ability to specify the pitch and midi note which will be the reference pitch
for the microtuning in use. This becomes a very important consideration
when one is using a number of different synthesizers and wishes to keep
them in tune with a given base frequency. It is very common for one to
specify a chosen concert pitch such as A440 Hz or C261.6256 Hz as a
reference for a microtuning, however, the flexibility of the TUN format
and Scala enables one to specify this frequency arbitrarily. In Scala this
reference is called Map Frequency.
As well as being able to specify the Map Frequency, one can also
specify a central midi-note, which will become the starting point for the
microtuning in use. Being able to specify a particular midi-note on the
controller, provides a way to map a microtuning beginning on any
desired midi key, making it easier to navigate the keyboard when there
may be more or less than 12 tones per octave, or where one may desire
to have the notes of a tuning fall on certain physical keys.
Important Note
When one uses a TUN microtuning-file in the , the above specified
mapping properties will override the Master Tuning reference. Normally
when one is using the default 12 Tone Equal Tempered Scale, the
Master Tuning will be used to make fine pitch adjustments around the
standard concert pitch of A440 Hz, but when one has specified another
pitch base for a microtuning when the TUN file is created in Scala, such
as C261.6256 Hz, the data in the TUN microtuning-file will provide a new
pitch reference.
LinPlug Organ 3 User Guide Page 46