KEYTEK CTS 2000 Instruction Manual page 78

OMNI Mode
ON/OFF
This mode only has an effect on reception; in fact, all instruments or slave devices that use it will play
all the MIDI information transmitted by the Master instrument or device, regardless of the channel
number to which it may have been sent.
Obviously, the slave units will only perform the operations for which they have been enabled, so if
you send dynamic signals, they will only be performed by devices equipped with dynamics and this
type of message will be ignored by the others.
Omni mode therefore does not allow slave units to be controlled separately using Midi channels.
This mode works polyphonically, i.e., pressing a chord on the master unit's keyboard will cause all
connected polyphonic units to play the chord simultaneously.
POLY Mode
In contrast to Omni mode, Poly mode allows the Schiave equipment to play only the information
encoded according to the Midi channel number assigned to it and which it has been previously
programmed to receive.
The Poly mode also sends polyphonic signals but in this case, for example when using a Master
keyboard that can be divided into two parts, the chord pressed in the left part will only be recognised
and performed by the Slave whose Midi channel code will be the same as that assigned to the left
half-keyboard, while the second Slave will only play the notes or chords played on the right half-
keyboard.
MONO Mode
Allows you to send channelled monophonic Midi signals for each polyphonic "voice" available on the
Master instrument.
For example, if we use an instrument with 4 polyphony as a master keyboard, we can assign a
different Midi channel to each "voice" and assign it to four different slave units (which in this case
can also be monophonic synths).
If we compose a C major seventh chord on the Master keyboard the first Schiava unit will play the C,
the second the E, the third the G and the fourth the B flat.
Since each device can be assigned a different timbre, it follows that the individual notes that make up
the chord can be played by a different timbre.
The above modes can be combined, but since choosing Poly mode automatically excludes Mono
mode and vice versa, there are 4 possible combinations:
Omni On, Poly
Messages will be acknowledged by all units regardless of transmission channel and are assigned in
polyphony.