Seiko QBT-30 Operating Instructions Manual page 19

Instructions to the engineering outfit
Audio cable
(available on the market)
Insert
LINE OUT
By turning on the "10 SEC. ADVANCE
WARMUP" switch, you can warm up the
amplifier 10 seconds ahead of melody
playing. (For details, refer to "9. Operation"
below.)
Normally, the volume of the external speaker is adjusted
with the volume knob of the external amplifier with the
LINE OUT LEVEL knob set at MAX.
For the engineering outfit
ON-OFF control of amplifier by timer
Amplifier (option)
M3 crimp
or CH2
terminal
(furnished)
(Turn to MAX.)
Speaker (option)
Amplifier
" "
10 seconds
LINE OUT
melody
Amplifier power supply
Volume of external
amplifier
(Volume adj.)