Rane MPE MIDI Programmable Equalizer Manual de usuario descargar pdf (Pagina 10)

Rane MPE Users Guide

2. Press the UP or DOWN keys to scroll to the

desired expression controller. Any single MIDI

continuous controller number ( 0-120) may be

selected. Scrolling past number 120120 selects

channel pressure aftertouch (displayed as aftaft),

or all controllers and aftertouch (displayed as

allall).

A third option is the auto-detect feature (dis-

played as detdet). You may scroll to this option,

or access it directly by pressing the UP and

DOWN keys simultaneously. Auto-detect forces

the MPE to assign the next received MIDI con-

tinuous controller as the expression controller.

This is useful if you aren’t sure what number a

particular controller is assigned to. Once you

have the detdet option in the SYSTEM display,

send a message from the unknown MIDI continu-

ous controller and the MPE automatically assigns

that controller number to the expression control-

ler.

A final option is offoff which disables the expres-

sion function. Scrolling past offoff brings you full

circle to continuous controller number 00.

3. Select a frequency band by pressing its key. The

current vector direction is displayed in the

EQUALIZER display. The display shows +1+1

for an upward (boost) vector, -1-1 for a downward

(cut) vector, and 00 for a flat vector. Remember,

bands with upward vectors boost relative to the

magnitude of the received expression controller,

bands with downward vectors cut. Bands with flat

vectors will not change.

4. Press the same band key to toggle the vector

between +1+1, -1-1, and 00.

5. Repeat steps 1-4 until all desired vectors are

programmed.

6. Press STORE to enter the Store function, or

EXPRESS to return to Normal Operating mode.

If you chose to store your new parameters, refer

back to the Storing Working Memory section for

further instructions. Remember, if you don’t store

your changes, you will lose them next time you

recall a new Stored Memory or Factory Preset.

Curve Weighting

Sometimes the need to combine two or more

equalization curves arises. In the old days of analog

graphic equalizers, you were forced to either cascade

several units, each adjusted with one of the curves,

or tweak the sliders on one equalizer to manually

derive the sum of the curves. The MPE 14 and MPE

28 provide a curve weighting function that puts

these cumbersome methods to rest.

With the MPE curve weighting operation, you

may add two curves in the MPE together. One curve

is always in Working Memory, the other is a speci-

fied Stored Memory.

One problem can arise when adding two curves.

For example, if each of two curves has 1kHz boosted

+10dB, their sum at 1kHz equals +20dB. The MPE

allows a maximum of 12dB boost. Oops. Fortu-

nately, the MPE is smart. If the resultant curve is out

of range, the entire curve shifts up or down to

accommodate the curve.

An example is in order. Say we add two curves

with the following parameters:

Level 50 125 315 800 2k 5k 12.5k

Curve 1: 0 6 7 4 -3 0 8 2

Curve 2:

0 6 6 6 6 8 8 8

Sum: 0 12 13 10 3 8 16 10

As you can see in the above table, the sum of the

two curves goes out of range at 125Hz and 5kHz. At

this point we have two options. First, we can simply

truncate the out of range bands to +12dB. This

works fine, but penalizes us unnecessarily. The more

elegant option shifts the entire curve down so the out

of range bands come back in range. In the above

example, the sum is shifted down 4dB so the 5kHz

band becomes +12dB. This results in the curve:

Level 50 125 315 800 2k 5k 12.5k

Sum: 0 8 9 6 -1 4 12 6

The curve is now entirely within range. Since we

shifted the curve down by 4 dB, the overall gain of

the unit has been reduced by 4 dB. We can take

advantage of the overall level adjustment to compen-

sate for this, resulting in the curve below:

Level 50 125 315 800 2k 5k 12.5k

Sum: 4 8 9 6 -1 4 12 6

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 33 34

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