150
Now scroll to the two parameters called LoPage and HiPage: LoPage should be set to Contr (MIDI
controller), HiPage to PolyPrs (MIDI polypressure). There are only 128 controller numbers per MIDI
channel, so that not all parameters of a Virus PART can be covered by controllers. On the Virus, this
problem was solved by splitting up its parameters into three Parameter PAGEs for data transport
purposes. Each of these three PAGEs can contain up to 128 parameters. A SINGLE program con-
sists of the parameters of the two first PAGEs. Parameters of the first PAGE are assigned to the
MIDI controllers, while the parameters of the second PAGE are sent and received by so-called poly-
pressure data. This structure of this data type is identical to that of controllers; polypressure is also
supported by sequencer programs. (This data type was initially created to allow the pressure
exerted on keys to be transmitted polyphonically, but this required a special approach to playing
that never really caught on. The Virus is the first instrument to exploit this data type in the interest of
putting further controllers at your disposal.)
Please note that the Virus allows you to control several PARTs via the same MIDI channel. This
means that an incoming controller would collectively address this parameter in all PARTs. This of
course defeats the purpose of routing several of these PARTs via the same channel, which is to
double up different sounds. For this reason, the convention in the Virus is that, when several of these
PARTs are patched through a single MIDI channel, only the PART with the lowest PART number is
addressed by incoming controllers; all other PARTs ignore this data. This applies solely to sound
parameters and not to so-called performance controllers such as the modulation wheel.
As an alternative to parameter control via controller and polypressure data, you have the conven-
tional system exclusive control option available (see ”MIDI Implementation” in the appendix, “The
Virus And Sequencers” on page 149). This system exclusive control option may be activated inde-
pendently for the first two Parameter PAGEs (under MIDI in the CONFIG menu), in which case this
control mode is the only type of remote control option that is active – you get exclusively system
exclusive control, as it were. The third parameter PAGE, in turn, lets you control the parameters of
the current MULTI PROGRAM as well as global and/or system parameters. This third PAGE is
addressed solely via system exclusive MIDI messages. The advantage of system exclusive control
is that you can address PARTs individually irrespective of what their current MIDI channel assign-
ments may be.
You’ll find a list of all controller and polypressure assignments in the appendix.
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