1 9
• Switch the Key Source control to Ext. The detector will now ignore the high
frequency signals (in this case, the cymbals), and will allow the drum sig-
nal though only when the drum is struck.
Keying can be used for more than simply removing noise. If a drum machine
is connected to the Key input, the signal at the channel input will be synchro-
nized with the drum machine signal.
For example, if the signal appearing at the channel input of the gate is a sus-
tained guitar chord, the resulting output would be the chord sound "played" to
the rhythm of the drum machine. Using this technique can produce some
interesting results. Try using different Key sources to trigger the gate. You
may find something you like.
The Control output is a unique feature of the 844 Series II. This output can be
used to trigger a drum machine or sequencer in time with whatever is input
into either the channel input or the Key input, offering a quick means of syn-
chronizing other equipment to the input.
S
PECIFICATIONS
Number Of Channels: 4.
Frequency Response: 10 Hz-30 kHz, ±0.5 dB
THD+Noise: 0.06%
Signal-To-Noise Ratio: -97 dB (ref.: 0.775 Vrms)
Input Impedance: 20 k
Ω
unbalanced, 40 k
Ω
balanced
Maximum Input Level: +21 dBu (ref.: 0.775 Vrms)
Output Impedance: 102
Ω
balanced, 51
Ω
unbalanced
Maximum Output Level: +21 dBu
Key Input Impedance: 30 k
Ω
Key Input Maximum Level: +21 dBu (ref.: 0.775 Vrms)
Threshold: Adjustable from -60 dBu to +10 dBu
Attenuation: Adjustable from 0 dB to 90 dB
Release Time: Adjustable from 20 msec. to 5 sec.
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