Altec Lansing digital signal processor Audio Functions, 7.3a Keyboard/Mouse Shortcuts, 7.3b Mute

Operating Manual -4048A digital signal processor

7.3 Audio Functions

Editing of audio controls is done through the use of scroll bars, numerical entry, various keyboard shortcuts, or by visually dragging filter points in the frequency response window. Ease of use, especially in the frequency response window, makes it possible for fast, potentially destructive mistakes, so plan carefully before making radical gain or filter changes.

7.3a Keyboard/Mouse Shortcuts

Convenient shortcuts allow for quick setups or edits, and are shown as follows:

Mouse shortcuts in the frequency response window . . .

Right Click-and-Drag	Change Q-Width
Left Click-and-Drag	Change Frequency
Left Click-and-Drag	Change Level

Keyboard shortcuts . . .

iChange to last input used

o Change to last output used

s Change the order in which parametric and crossover filters are scanned

d Change to the Delay frame

g Change to the Gain frame

e Change to the EQ frame

r Change to the Routing frame

h Change to the HpfLpf frame

l Change to the Limiter frame

m Mute the current input or output channel

ESC(while dragging a filter)		Resets the filter position to its starting position
c	Cut Active Filter
z	Zero Active Filter

Ctrl-c Cut Master Gain

Ctrl-z Zero Master Gain

7.3b Mute

The 4048A allows the user to mute all inputs or outputs. When muted, an input or output's red Mute LED is lit. To mute or unmute all outputs simultaneously, click on the <Mute> menu heading and select the <Mute all> or <Unmute all> option. Inputs can be muted or unmuted one at a time. Additionally, when recalling a new preset to the 4048A, the user is prompted to mute all outputs, as a new preset can introduce dramatic changes to the system configuration.

7.3c Gain

For best signal to noise performance, provide an input signal with a nominal 0dBu level. Using significant input or output gain to make up for a weak input signal compromises the noise performance of the 4048A.

Input and Output Gain are separately adjustable from -40dB to +12dB. Due to limi- tations within the graphical interface, fine tuning gain settings in 0.1dB steps is accomplished using the <up/down arrows> on the keyboard. Changes of exactly 1dB are quickly accom- plished using <PageUp/PageDown> buttons. To instantly return a gain setting to 0dB, press <Ctrl + Z> (see other keyboard shortcuts in 7.3a). Additionally, The output gain menu is also used to invert the polarity of outgoing signal for that channel.

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