some advanced recording techniques for your ReVox A77...

The headphones may be connected to jack PHONES, however, the left hand earpiece must be suitably disabled.

For rehearsal and monitoring during recording the left-hand speaker is used. If a separate power amplifier is used connect it to OUTPUT CH I. When using headphones use right earpiece only.

VOLUME control (11) adjusts the loudness for tempo playback and monitoring as well. Use BALANCE control (13) adjust for possible differences in the tempo track and monitoring volume.

Third and subsequent copies or overdubs:

The recording on channel I which now contains the basic melody or voice and two additional voices or instruments may again be transferred to channel II by performing the operations described above.

With high quality tape material and optimum modulation levels up to six transfer operations should be possible.

Echo effects:

Since your A77 recorder is equipped with separate recording and playback heads, echo effects are possible without the use of any additional equipment.

Already during recording, the recorded signal is picked-up by the playback head. When returning that signal to the recording head again, it will be recorded on tape once more but delayed by a time interval equal to the distance between the two heads.

The time intervals at which the echo signals repeat themselves vary with tape speed: 1 7/8 ips (special version) 0.70 sec.

3 3/4 ips 0.35 sec.

7 1/2 i ps 0.175 sec.

15 ips (HS) 0.087 sec.

As can be seen from the above, reverberation effects are best achieved at the higher tape speeds, whereas the lower speeds are more suitable for echo effects.

Echo effects during recording:

Connect microphone to input MIC CH II.

Turn input selector channel II (18) to position MIC LOW (or HI respectively).

The potentiometer LEVEL II (17) controls the direct portion of the sound which is to be recorded from the microphone input. This level should be kept as high as possible (while avoiding over modulation in combination with the echo signal).

Turn input selector channel I (16) to position I > II.

Press record pre-selector button REC CH I (32). (Button REC CH II must be in its released position).

The intensity of the echo effect is determined by the position of the potentiometer LEVEL I (15). When opening that potentiometer only slightly, the echo effect will be faint and rapidly decaying. By contrast, if that potentiometer is opened too wide, so that the echo level equals or exceeds the level of the original sound, a feedback howl or whistling will set-in (this may be used intentionally to produce special sound effects).

Turn monitor selector (14) to position NAB (or TAPE).

Turn stereo/mono mode selector (12) to position I.

If the recording has to take place on channel II, the

microphone must be connected to input MIC CH I.

Turn input selector for channel II (18) to position II > I.

The functions of the record controls are reversed as well (LEVEL I (15) microphone, LEVEL II (17) echo).

Press record pre-selector button REC CH II (35) (button REC CH I (32) must be in its released position), and turn stereo/mono mode selector (12) to position II.

Adding echo to an existing recording:

The recording to which echo is to be added is already present on track I. The adding of echo takes place while transferring that recording to track II.

Turn input selector channel I (16) to position I > II.

The potentiometer LEVEL I (15) controls the recording level of the sound which is being transferred onto track II. That level should be kept as high as possible (while avoiding over modulation in combination with the echo signal).

Input selector channel II (18) to position II > I.

The potentiometer LEVEL II (17) is used to control the intensity of the echo effect.

Press record pre-selector button REC CH II (35). (Button REC CH I must be in its released position).

Turn monitor selector (14) to position NAB (or TAPE).

Turn stereo/mono mode selector (12) to position II.

When transferring from channel II to channel I the input selectors remain at their