PreSonus FireBox - Manual (Page 19)

3 CONTROLS AND CONNECTIONS
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MIDI stands for “Musical Instrument Digital Interface”. However, the MIDI standard
goes well beyond just instrumentation and sequencing. The MIDI inputs and outputs
allow connection and/or communication with external MIDI equipment. One function of
this port is MIDI programming. This port can also be used for MMC (MIDI Machine
Control) and MTC (MIDI Time Control). Please consult the manual of the software
manufacturer to learn setup and usage of different MIDI applications.
Line Outputs (3, 4, 5, 6). Balanced line level outputs. These connectors will accept
either balanced (TRS – Tip Ring Sleeve) ¼” cables or unbalanced TS (Tip Sleeve) ¼”
cables.
Main CR Output. The level of this output is controlled by the Main volume knob on the
front of the unit.
Line Inputs (3 and 4). These connectors will accept either balanced (TRS – Tip Ring
Sleeve) ¼” cables or unbalanced TS (Tip Sleeve) ¼” cables. The Line Input can also
be used as a standard line level input for devices that do not require pre-amplification
(such as a CD player, drum machine, sampler and etc.).