On 25.09.2018 13:32, Jeanette C. wrote:
Hey hey,
I am helping a friend to set up a live performance system. The general
requirements are: one master keyboard connected to a notebook, which
hosts several plugins (VST through wine and Pianoteq in some form). The
challenge: switch the sound engine which the master keyboard is
controlling via MIDI (from the keyboard) or through another cheap
controller.
The current state: use Carla to host the instruments and try to map
certain MIDI controllers to switch the internal routing. To that end I
found one thread on Linux Musicians, where FalkTX suggested using some
MIDI filtering plugin (like pizmidi-plugins or x42) or a standalone app
like mididings. No final solution was posted/described.
Hi Jeanette
I'm using a mididings router for exactly that purpose.
It has 2 inputs and 8 outputs, all either Jack or Alsa,
depending on the backend selected.
One input ('data') receives the MIDI data to be routed
and a second one ('ctl') listens for certain CC numbers
that will switch the routing to one of the outputs.
I don't fully understand every aspect of it (e.g. why the
scene numbers are magically tied to the CC numbers
by a +1 relation), copy-pasted and adapted it years ago.
Since then it serves the purpose.
Run it with
$ mididings -f <filename>
with <filename> containing the following:
from mididings import *
# setup backend, names and ports
config(
# select alsa backend, alsa or jack
backend = 'alsa',
# alsa/jack client name
client_name = 'adingsroute',
# two inputs, one to control scenes, one for the
in_ports = ['data', 'ctl'],
# 16 output ports
out_ports = [
'CH-1',
'CH-2',
'CH-3',
'CH-4',
'CH-5',
'CH-6',
'CH-7',
'CH-8',
],
)
run(
scenes = {
32: Scene('input -> CH-1',
Port('CH-1')
),
33: Scene('input -> CH-2',
Port('CH-2')
),
34: Scene('input -> CH-3',
Port('CH-3')
),
35: Scene('input -> CH-4',
Port('CH-4')
),
36: Scene('input -> CH-5',
Port('CH-5')
),
37: Scene('input -> CH-6',
Port('CH-6')
),
38: Scene('input -> CH-7',
Port('CH-7')
),
39: Scene('input -> CH-8',
Port('CH-8')
),
},
# ctl data: filter by port and stuff,
# use number of EVENT_* for scene selection
control = PortFilter('ctl') >> CtrlFilter(31,32,33,34,35,36,37,38) >>
CtrlValueFilter(0) >> SceneSwitch(EVENT_CTRL),
# input data: filter by port
pre = PortFilter('data'),
)
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