Roland SPD-20 Owner's Manual page 51

Adjusting the Trigger Signal Detection Time (Scan Time, Scn)
fig.60-a
NOTE
00–30 appears in the display.
The trigger signal waveforms produced by some types of drum pads or acoustic drum triggers have
rather long attack times, which can result in unstable volume levels, even when the same force is used
to strike the pad; or can result in unreliable detection of striking force. In such cases, by adjusting the
amount of time between the striking of the pad and detection of that strike (Scan Time), you can achieve
the correct detection of striking force.
fig.60-b
Scan Time
0
For reliable detection of Trigger signal output, adjust the time for reading the trigger signal (Scan Time).
For more on how to set these values, refer to p. 48.
To maximize the speed at which sounds are triggered, set the Scan Time value as low as possible.
MEMO
For P 1 and P 2 trigger types, increase the Pd7 Scan Time values. For K 1 and K 2, increase the Kd7
Scan Time values.
When you strike the pad, the strength with which the pad is struck (velocity) is shown in the display,
with six possible levels. When the pad is struck hard, the velocity is set to a value of 127.
fig.95
(Available Settings) 0.0–0.3 ms (0.1 ms steps)
Scan Time
PD-7
0
Time
Strength
of Striking
Hard
Soft
A Pad with a slow Trigger
signal waveform attack
Time
Velocity
127
100–126
75–99
50–74
25–49
1–24
1
2
3
4
5
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