3.Go to the next page and set the XTALK, DCAY and NOISE levels all to 00. This low level will allow the maximum signal to be detected by the D4.

4.Press the EXT TRIG button again to get to the GAIN page. Using the bar graph meter, adjust the level according to the severety of the false triggering. If notes are constantly triggering, use a high gain. If only occasional, select a lower level.

Note: The peak level indicator (a period) explained in section 5.7 will not appear next to the value when in the Unassigned mode.

5.Now when the D4 receives a signal (from the tom 1 pad) which was generated by the string pop from the bass, not only will it compare this signal to the other drum pads, it will also compare it to the bass. In essence, the D4 isolates the bass from the noise floor and "thinks" the bass is a another drum pad. It will now treat it the same as any other pad and "filter" out the unwanted signals.

Note: Note Chase will not follow any trigger that has been set to Unassigned. To view an Unassigned trigger’s VU-style bar graph meter in order to adjust gain (section 5.7s), use the Data wheel to select the corresponding trigger input (section 5.0).

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Alesis D4 manual