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Metering, Chapter 7
7-2 ALESIS M20 REFERENCE MANUAL 1.06
7.2 METER SETUP
The VU meter scaling, headroom, decay time, and peak hold time are all adjustable using the
Display menus. The Display button is in the lower left group of buttons beneath the meter
display.
Scaling determines whether the meter range is -72 dB to 0 (Normal; this is the default) or -2.0
to +2.0 (Fine).
Headroom sets the headroom amount for the Fine VU meter mode (it does not affect the
normal mode) by letting you specify what value the 0 dB marking represents. The value
ranges from 2 to 22 dB, in 1 dB steps (default = 15 dB).
Decay sets the time for a meter segment to turn off after the signal goes below that level, with
a range of 1 to 99. Each step represents 5 milliseconds, with higher numbers standing for
longer decays. The maximum decay of 99 means a segment will hold for 500 ms. (1/2
second). Default = 10.
Peak hold time sets how long peaks will be held when the meters are in momentary Peak
Hold mode, from 1 to 99. Each step represents 250 milliseconds, with higher numbers
standing for longer holds. The maximum decay of 99 means a segment will hold for
24.75 seconds after level has fallen. Default = 8
Operation You press… You see…
Enter VU meter scaling
setup
Display button Display says VU Meter
Scale
Edit VU meter scaling Up/Down buttons Display shows Normal
or Fine scaling
Enter VU meter
headroom page
Display button again Display says Fine
Headroom
Edit VU meter headroom Keypad or Up/Down
buttons to choose the
headroom amount
Display shows amount of
Fine headroom in dB
Enter VU meter decay
page
Display button again Display says VU Decay
Edit VU meter decay Keypad or Up/Down
buttons to choose the
amount of decay
Display shows amount of
meter decay time
Enter VU peak hold page Display button again Display says VU Peak
Hold
Edit VU peak hold Keypad or Up/Down
buttons to choose the
peak hold time
Display shows amount of
peak hold time