This article describes how to create persistent indicator LEDs for an active selection on the Select-8 or Volume/Select-8 controller.
The Select-8 allows users to trigger events within the Audia and Nexia DSP hardware. This can be any event that can be triggered either directly with logic, or indirectly using preset recalls triggered by logic. The logic output node of the Select-8 block must be connected to the login input node of another DSP block.
Once a logic output port on the Select-8 is wired to a logic input port in the DSP the selection will be made active and the LED can indicate an available selection. If you do not have 8 logic connections to allocate in your DSP there is no problem for the user, just connect the number of nodes needed and the unconnected node's LEDs will be "skipped over" on the wallplate as the user clicks through the selections.
Certain DSP objects which have constant states, such as the Source Selector, will pass information back to the Select-8 logic nodes to indicate the current state of the DSP object. The LEDs on the Select-8 will illuminate to indicate the active state. The flip-flop gate is another latching object that will return state information to the Select-8.
Other DSP objects that create a momentary event will return only momentary state information, resulting in a blink of the LED. It is possible to emulate latching state information for this type of control with the addition of flip-flop gates.
When combined with the Select-8 and presets, the flip-flop can be used to cause the indicator LED to remain in a state corresponding to the "state" of the control.
The flip-flop gate's state can be set while offline (double click to open the block). The state needs to be edited and saved as part of each preset while offline so the active (set) channel will correspond to the preset logic node being called. This state will then be recalled with the preset, returning unused preset channel indicators to an off state, and leaving the active preset's channel indicator active (set).
Be sure to select the wires from the Select-8 to the Flip-flop gate and do Ctrl-F (bring to front) so the lines will take precedence over those of the Remote Preset block in triggering the LED state.
The mute button is a momentary object. Adding a flip-flop in line with the mute state will create a latching behavior for the mute button and will return the correct state of the mute switch to the Select-8 LED.