MIDEX-8
English – 36
Using several MIDEX-8 simultaneously
If the eight MIDI inputs and the eight MIDI outputs of one MIDEX-8 are
not enough, you can combine several MIDEX-8 and thus adapt the num-
ber of inputs and outputs to your needs.
Theoretically (i.e. according to the specification) each USB bus should let
you address up to 127 USB devices. However, this is merely a theoretical
consideration since the USB bus would not be able to handle the load
from a large number of MIDEX-8 devices.
Depending on the available resources, up to four MIDEX-8 can be con-
nected to each USB controller bus, via an actively powered USB hub.
If you wish to connect more than four MIDEX-8, you must use another
USB controller bus and another actively powered USB hub.
If you connect more than one MIDEX-8 to your computer, the MIDEX-8
driver software will automatically assign a device number to each unit
which you can change manually. The units are then initialized in the cor-
rect order each time you start your system. This ensures that the con-
nected MIDI devices are always addressed correctly.
Usually, your computer will provide two separate USB controllers that
each drive one USB bus (see table below for more information).
How many MIDEX-8 you can connect to your computer is governed by
many factors:
The USB bus
bandwidth
needed by each
MIDEX-8 unit
One MIDEX-8 consumes ca. 21percent of the bandwidth that is
available on one USB bus.
The USB bus
bandwidth
needed by other
USB devices,
connected to the
same USB
controller bus
Some USB Audio interfaces can consume 50 to 70 percent of the
available USB bus bandwidth.
It’s a simple calculation: if you have connected one such device to a
USB bus that provides full bandwidth, this bus will only provide
enough bandwidth for one or two MIDEX-8 units.
If the available bandwidth becomes insufficiant, the operating
system will generally show an alert message.
A USB bus overload will not damage your hardware.
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