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M-Audio MIDISPORT 8x8/s [24/52] Smpte write button

The SMPTE Reader is capable of automatically detecting the incoming SMPTE

format. When it does, it displays the format to the "Format" LEDs on the

MIDISPORT front panel. Automatic format detection will take between 3 and 31

frames, depending on the incoming format and the value of the first SMPTE

frame received. When using the MIDISPORT with a sequencer program synced

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

proper synchronization.

IMPORTANT: When 29.97 format code is received at the SMPTE In

port, the MIDISPORT will indicate 30 fps. This is because MTC

does not support 29.97 – instead it uses 30fps format messages

that run at the slightly slower 29.97 fps rate.

The SMPTE Reader has the ability to "flywheel" during periods of invalid

incoming time code. Flywheeling is the ability to continue to generate

sequential time code even during drop outs of the incoming SMPTE to which the

MIDISPORT is synchronized. The SMPTE reader will continue to flywheel

through a set number of SMPTE frames before deciding the SMPTE input stream

is "dead." If the incoming SMPTE becomes valid again in less frames than the

flywheel setting, everything continues normally. However, if the number of

invalid frames exceeds the flywheel setting, the SMPTE Reader will declare that

it is no longer locked and then quit regenerating and sending MTC. The

Flywheel setting is configured via the Remote Control software and may be set

to anything between 0 and 127. "Jam sync" is equivalent to a flywheel setting of

0 frames (see the section "SMPTE/MIDI Time Code Tutorial" later in this

manual) and allows the SMPTE reader to continue generating time code long

after the incoming SMPTE data is invalid or no longer present. In fact, the

generator will continue to put out correct sequential SMPTE and MTC time code

indefinitely, or until you press the WRITE button to abort it.

Once locked to a valid incoming SMPTE stream, the SMPTE Reader lights the

"Locked" LED on the MIDISPORT front panel. 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 is capable of decoding User Bits from the incoming SMPTE

stream. The most current User Bits are stored to the MIDISPORT internally 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" button — 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. The default start

time for SMPTE writing is 01:00:00:00, or one hour.

M-Audio MIDISPORT 8x8/s [24/52] Smpte write button

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