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Biamp Systems

De-selecting or muting sources with a RED-1

The RED-1 block and the Source Selection block were designed to work well together.  Simply connecting the logic outputs of the RED-1 block directly to the Source Selection block allows you to easily select a source.  

However, when the Source Selection block is controlled with logic, there isn't an obvious way to de-select a source (i.e., to listen to no source).  This article demonstrates a few easy workarounds for this problem.

De-selecting sources

This workaround for de-selecting a source is based on the fact that a Source Selection block only allows one source to be selected at a time.

  • Create a Source Selection block that has one more input than you need (if you've already created the block, you can right-click on the Source Selection block and select Edit Block Parameters to edit its channel count). This extra input will not be connected to anything.
  • If the RED-1 block connected to the selector doesn't have extra logic output, right-click on the block and select Edit Block Parameters to add another output.
  • Wire the logic output to the extra logic input on the source Selector block .
  • Double click the RED-1 block.
  • Add a new control item to de-select and assign it to the corresponding logic output.

De-selecting sources with RED-1.GIF

Now, whenever the RED-1 selects the empty source, it will turn off all of the other sources.

Pros: Selecting a source is all you need to do to get the system working again.

Cons: If you want to resume playing the same source that was playing before, you still have to explicitly select that source.

Muting sources

Another way to select no source is to simply mute the signal using a Mute Control block.

  • Add a Mute Control block with control input (logic) and a Flip-Flop Gate (which is a type of Logic Gate).
  • Rewire the output of the Source Selector block so it goes thru the Mute Control block.
  • Connect a logic output of the RED-1 to the Flip-Flop Gate.
  • Connect the output of the Flip-Flop Gate to the logic input of the Mute Control block.
  • Double click the RED-1 block.
  • Add a new control item to mute and assign it to the corresponding logic output.

Source mute with RED-1.GIF

Whenever the bottom selection on the RED-1 is selected, the source audio will toggle between being muted and unmuted.

Pros: Unmuting get you back to the source that was playing before you muted it.

Cons: Changing the source when the system is muted will not make the source play. You'll still have to un-mute.

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