Tuning Tables; Midi Mapping - H-Pi Instruments Tonal Plexus TPX 2s User Manual

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3. Tuning Tables

Each tuning table provides a simple 1 to 1 correspondence between raw MIDI Notes played and
retuned MIDI Notes output. Any MIDI Note input can be retuned to any pitch output, in any register
with any frequency, limited only by the internal or external synthesizer.
There are 32 memory locations, numbered 0 - 31, available for storing tuning tables. There are 16
preprogrammed default tuning tables, including the Master Tuning 205ET. The default tuning tables
may be overwritten, and there are no protected memory locations. Each table is given a 16-character
name. The name and number of the currently selected tuning table is displayed on the top row of the
LCD. For each MIDI Note, there are three values stored in the tuning table: MIDI Note, Pitch Bend
MSB and Pitch Bend LSB. When a MIDI Note ON message is received, these values are looked up
and immediately transmitted to MIDI OUT in the following order: Pitch Bend MSB, Pitch Bend LSB,
MIDI Note ON.

MIDI Mapping

Each octave of a Tonal Plexus keyboard uses two MIDI Channels, each assigned to six columns of
keys. These two MIDI Channels are shown as CHANNEL A and CHANNEL B in Figure 2 (next page).
The MIDI Note numbers are the same in each octave, and the MIDI Channels are fixed according to
the size of the keyboard. The chart below shows MIDI Channel assignments for TPX2s and TPX4s.
These MIDI Notes and Channels should be sent from external devices connected to MIDI IN.
OCTAVE
CHANNEL A
CHANNEL B
TPX4s
TPX2s
MIDI Notes 0-104 are used from Channel A and MIDI Notes 0-105 are used from Channel B. This
leaves 22 MIDI Notes (105-127) unused on Channel A and 21 MIDI Notes (106-127) unused on
Channel B. These 43 unused MIDI Notes correspond to 43 unused Tuning Table Registers for each
Tonal Plexus octave. Although these free memory registers are ignored by the keys of a Tonal
Plexus keyboard, they may be accessed from an external keyboard by sending the correct MIDI
Notes on the correct MIDI Channels to MIDI IN.
MIDI
Note
played
1 2
1 3
2 4
Tuning
Table
lookup
3 4 5
5 7 9
6 8 10
X X X
X X
Tuned
MIDI
Note
OUT
6 7 8
11 13 15
12 14 16
X
11