Akai MPC Operator's Manual download pdf (Page 200)

200

While one of these event types is selected, the PASS EVENT? field

displays either a YES indicating that event will be recorded into sequences

or a NO indicating that event type will be removed from the midi input

data stream when encountered. This status may be changed using the

DATA CONTROL.

An example of a good use of this function is to prevent "channel pressure"

data (also called "aftertouch") from being recorded into your tracks. If you

are using a keyboard which produces channel pressure messages, all of these

continuous messages will normally be recorded into the track, whether your

synthesizer uses these messages or not. This will cause much extra sequence

memory to be used and will cause the sequences to work much harder to

play all of these messages, possibly causing note delays, if the sequence

contains many notes. To avoid this, turn off the recording of continuous

controller messages unless your synthesizer is using them. To do this, select

CHAN PRES in the EVENT field, then select NO in the PASS EVENT?

field.

• The MINIMUM CHANGE field: There is another field called MINIMUM

CHANGE which only appears if the EVENT field is set to BEND, CHAN

PRES, MIXER VOL, MIXER PAN, ECHO VOL, or controllers 0 through

31. These are all "continuous data" event types, meaning that large numbers

of these events are used to simulate a gradual change in the specified

parameter. For example, when you move a pitch bend wheel on a keyboard,

a large number of pitch bend events are output from the keyboard, and all of

them would be recorded into the active track. The problem with recording

all of these events is that they use a large amount of memory and they cause

the internal computer to work very hard, causing possible timing delays if

large amounts of these events exist in a sequence. In many cases, however,

many more of these events are output from the keyboard than is necessary

to produce the desired effect.

The MINIMUM CHANGE field is used to "thin out" the event data for the

above specified event types, thereby reducing the total number of events

which will be recorded into tracks. It works by only recording events which

have changed more than a specified amount since the last received event of

the same type, and the amount is set in the MINIMUM CHANGE field. As

with the PASS EVENT? field, the MINIMUM CHANGE field shows the

value associated with the event type shown in the EVENT field. For

example, to "thin out" incoming channel pressure events:

1. Set the EVENT field to CHAN PRES.

2. Set the PASS EVENT? field to YES.

3. Set the MINIMUM CHANGE field to 5.

This means that an incoming channel pressure message could only be

recorded if its value had changed by more than 5 from the last

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Akai MPC Operator's Manual Page 200

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