Alesis D4 manual About Trigger Parameters, This is how it works

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About Trigger Parameters

The D4 now offers five user controllable trigger parameters.

These are:

•VCURVE. This represents the velocity curve, or the sensitivity of the trigger input. There are eight separate curve tables, 0 through 7. Using these settings it is possible to adjust the D4s' triggers to accompany a wide variety of playing styles, and to help compensate for sensitivity variances between different brands of drum pads and triggers.

The lower the setting, the less sensitive the velocity curve and the higher the setting, the more sensitive. For example, a pad using a setting of 7 will reach a MIDI velocity of 127 with just a moderate strike. For a pad whose VCURVE setting is 1, only a very hard hit would generate such a velocity.

For average type of play (striking pads with velocities ranging from very soft to very hard) the default setting of 4 is ideal in achieving the full range of sensitivity which corresponds to MIDI velocities of 1 through 127.

Note: Curve 0 is named "Unassigned". The function of this curve is explained fully in section 5.2 "Trigger Velocity Section".

•XTALK. (Crosstalk). Sometimes hitting one pad will cause a nearby pad to false trigger or "crosstalk". This is generally due to stand vibrations which can affect the other pads. These vibrations send signals to the nearby pads which can cause false triggering. The XTALK adjustment acts as a suppression control.

A higher value adjustment equals greater suppression of the signal, a lower value equals less suppression. Therefore, the higher the value setting, the less likely the nearby pad (or drum) will trigger from stand or head vibrations.

This is how it works:

First, you strike a pad and the D4 triggers its sound. Shortly after this hit the D4 receives a secondary, "softer" signal from a nearby pad. Before the D4 will play this softer signal, it will scan the other inputs to determine whether this was a legitimate hit, or simply a vibration from a stand or head.

It does this by comparing the level of this soft signal with the threshold level set in the XTALK parameter. If this secondary signal level is greater than the allowable threshold level, the D4 will trigger its sound. If the signal is less than the allowable threshold level, the D4 will ignore it.

By adjusting the crosstalk level to a higher value, you set a higher threshold for the signal to exceed, and reduce the ability of a pad (drum) to crosstalk. The following chart shows a scenario with a properly adjusted XTALK level.

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Contents Alesis Drum SET Management Midi Functions Principal Features IntroductionReturn Your Warranty Card NOW HOOKUP/INSTANT Gratification2A Installation 2B Hook Up Audio rear panel2C Hook Up Midi rear panel 2D Hook Up External Triggers rear panel2G Select Drum Sets 2E Hook Up Power rear panel2F Turn On Power 2H Audition Different Drum Sounds Page 2I Assign Drum Sounds to Particular Midi Notes 3A The Voice3D Midi Note Range 3C About Defaults3B About the Edit Buffer About the User Interface 4A Function Buttons 4B Cursor Buttons4C Multi-Page Functions 4D Editing Parameter Values4E The Store and Note Chase buttons 4F The Preview ButtonSelecting Drum Sets STORING/NAMING AN Edited Drum SETRecalling Factory Drum Sets Recall AlesisPage Function Buttons VoiceTune OutputDrum SET Output MainGroup Button Mode MultiEXT Trig Drumset Root Midi ButtonCopying a Notes Parameters to Another Note Midi Functions Drum SET Root NoteTurn the Data wheel to select the desired Drum Set root note Program Change Enable Midi Channel SelectionMidi THRU/OUT Selection Channel Omni Thru OFFController Enable Prog Change on Controllers onMake sure the cursor is under the Controllers status Program Table Program Change TableSave Data VIA Midi 6A Save to DataDisk Receive Data from Another Midi Device 7A Load from DataDiskExternal Triggering About Trigger Parameters This is how it worksPage Example Trigger Selection TRIG01 VCURVE4TRIG02 VCURVE4 Trigger Note SelectionTrigger Velocity Selection Method One Page Trigger Parameter Selection Trigger Crosstalk SelectionTRIG02 XTALK30 DCAY10 NOISE00 TRIG03 XTALK30 DCAY10 NOISE00Page Trigger Dcay Control Selection Trigger Noise Level SelectionTrigger Gain Selection TRIG01 GAIN50Footswitch Mode Footswitch Mode HI HAT Pedal8A Understanding Hi Hat Pedal Mode Page Midi Basics Midi Hardware3A Voice Messages Midi Message BasicsChannel Messages Page 3B Mode Messages System Common MessagesBooks on Midi Videos on Midi
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