Operating instructions

4.2.6 Rehearsal of Overdubs and Punch-Ins
For the overdub and punch-in procedures discussed in § 4.2.4 and § 4.2.5
there was no way to monitor the new input signal unless and until the
machine was recording. It may be desirable to do "dry runs" (i.e., rehearse
the overdub or punch-in) by playing previously recorded tracks through the
record head and sync amps and by monitoring the input of the tracks to be
recorded.
4.2.6.1 Rehearsal of Overdubs
1. Press the INDIVIDUAL button on the Remote Control Unit so the
individual Output Selector switches can be operated.
2. Set the channels to be recorded to Input mode (set switch to INPUT
position) and set the other channels to Sel·Rep mode (set switch to
SEL·REP position).
3. Engage the ALL SAFE switch (adjacent red indicator on). The position of
individual READY/SAFE switches is not significant for this step (although
presetting the switches according to the intended overdub or punch-in
may be useful).
4. Press the PLAY button. The input signal for all rehearsal tracks and the
signal from the record head and sync amp for all other tracks will be
monitored.
5. To end the overdub rehearsal, press the STOP button.
4.2.6.2 Rehearsal of Punch-Ins
1. Press the INDIVIDUAL button on the Remote Control Unit so the
individual Output Selector switches can be operated.
2. Set the channels to be recorded to Input mode (set switch to INPUT
position) and set the other channels to Sel·Rep mode (set switch to
SEL·REP position).
3. Engage the ALL SAFE switch (adjacent red indicator on). The position of
individual READY/SAFE switches is not significant for this step (although
presetting the switches according to the intended overdub or punch-in
may be useful).
4. Set all channels to Sel·Rep mode by pressing the ALL SEL·REP button.
All tracks will be reproduced from the record head and sync amps. At
the instant the punch-in is to be initiated, press the INDIVIDUAL button
to switch the rehearsal tracks to Input mode.
5. There are two ways to end the punch-in rehearsal.
❑ If the insert is to be ended but the tape monitoring to be continued
for a second punch-in rehearsal, press the ALL SEL·REP button.
❑ If all punch-in rehearsals are finished, press the STOP button.
MTR-90III Operation and Maintenance Manual
October 1990
Section 4 Operation
4 - 7