M-Audio Biport 2x4s [10/48] Smpte write button

displays the format to the “Format” LEDs on the BiPort front panel.

Automatic format detection will take between 3 and 31 frames, depend-

ing on the incoming format and the value of the first SMPTE frame

received. When using the BiPort with a sequencer program synced to

MIDI Time Code, at least 3 to 5 seconds of pre-roll are recommended for

proper synchronization.

Once locked, the SMPTE Reader lights the “Locked” LED. Whenever

invalid incoming SMPTE is detected, the “Locked” LED will blink for

approximately 0.25 seconds for each bad frame, or until flywheeling has

completed.

The SMPTE Reader may be configured only via software. The reader

configuration includes the flywheel setting, which has a power-on

default setting of 15 frames. It may be adjusted to jam sync as well as

flywheel - jam sync is equivalent to a flywheel setting of 0 frames (see

the section “SMPTE/MIDI Time Code Tutorial” later in this manual).

Important: Powering down the BiPort 2x4s will reset all

internally-stored values to their factory defaults.

The SMPTE Reader is capable of decoding User Bits from the incoming

SMPTE stream. The most current User Bits are stored to the BiPort inter-

nally and may be used later during SMPTE writing.

SMPTE “Write” Button

The SMPTE “Write” button has two purposes: 1) to manually control the

SMPTE writer, and 2) to stop the SMPTE Reader when it is performing a

“jam sync.” When the “Write” button is pressed and immediately

released, SMPTE time code starts writing at the preset start offset. The

SMPTE Writer will continue to run until the “Write” button is pressed

again. The “Write” button may also be used to change the start offset.

To manually increment the start offset, press and hold the “Write” but-

ton — this will increment the stored start offset by 1 hour every time the

“Write” LED blinks. The blinking occurs approximately once a second.

Release the “Write” button to begin writing at the new offset.

When the SMPTE reader is performing “jam sync,” it will continue to

run indefinitely. However, this may be aborted by pressing the “Write”

button.