Operating instructions

4.2.5 Sel·Rep Recording (Punch-Ins)
Punch-ins are performed when it is necessary to insert new material into a
track that has already been recorded without recording the entire track again.
Punch-ins allow monitoring of previously recorded material on the tracks
selected for recording, right up to the instant the track is put into Record. At
the moment that the track(s) enter Record mode, the MTR-90III switches the
output of the tracks being recorded to Input monitor so that the new material
can be monitored as it is being recorded in synchronization with the material
recorded earlier.
NOTE: For rehearsal of Punch-ins see § 4.2.6.
1. Rewind the tape to a point just before the beginning of the section to be
recorded.
2. Move the ALL SAFE switch to its OFF position (adjacent red indicator off)
and press the ALL SEL·REP button.
3. Set the READY/SAFE switches for all the tracks that are not going to be
recorded to Safe. Set the READY/SAFE switches for the tracks that are
going to be recorded to Ready.
NOTE: When the tape is stopped, the input of any tracks set to Ready mode
will be monitored unless SW1-2 on the TRANSPORT CONTROL PCB
Assembly is off (see § 2.1 Step 2).
4. Begin playback. Listen to the monitor and when the beginning of the
punch-in section is played, press the RECORD button to begin recording.
Best results are obtained by punching-in during a pause on the tracks
being recorded (on the off-beat). The input signal from the channels
being recorded and the signal from the tape from the record head and
sync amp on those tracks not being recorded will be monitored.
NOTE: There is a short delay from the instant the RECORD button is pressed
to the initiation of recording due to the gapless punch-in feature.
5. There are two ways to end the punch-in:
❑ Press the PLAY button to end the insert but continue monitoring the
tape for a second punch-in.
❑ Press the STOP button to end the recording all punch-ins. Engage
the ALL SAFE switch as a further precaution.
Section 4 Operation
4 - 6
October 1990
MTR-90III Operation and Maintenance Manual