Keyboard Scaling is a parameter found in many keyboards. It's a way manufacturers allow sounds to be altered smoothly across a keyboard (in an attempt to make acoustic type sounds more realistic across the entire range of the keyboard) . In many modern keyboards level scaling changes the loudness of the sound. Many analog synths use this feature to control filter cutoff from the lower to higher octaves.
It's sometimes called keyboard tracking or keyboard following.
The DX7s Keyboard Level Scaling settings allow the envelope levels to be adjusted across the keyboard.
The break points sets the point to split the keyboard's scaling.
ie.. what the DX7 treats as a "high note" and what it treats as a low note.
The breakpoint can be specified anywhere between A1 & C8
Level scaling on the DX7 allows you to change the level of a modulator or a carrier depending on where you play on the keyboard. For example, you can slowly decrease the level of modulation as you go up the keyboard.
Once you set where the break point is, you can then choose the type of curve (of the envelopes)to the left & right of the breakpoint. Pressing the CURVE key alternates between R KEY SCALING and L KEY SCALING displays. Four different curves are available as shown in the figure.
For example, will the operator increase or decrease in volume as you go up the keyboard?
Will this change be in a linear or exponential manner?
The depth of each curve varies between a 0 to 99 range.
A zero setting results in a flat (no variation) curve.
A 99 setting produces a maximum scaling depth.
Keyboard scaling is a separate menu on the standard DX7. Go to edit mode and click through all the menus until you find Keyb Scaling settings.
By giving each operator different values, you can get lots of interesting effects.
Scaling the modulators will make the sound brighter as you go up the keyboard. This emulates many real instruments.
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