Input Left and Right Channel Toggles

Macros: InL, InR

You may acquire input signals from either one or both channels by selecting the desired buttons here. If you only have a single signal line to monitor, there is usually no point to having both channels active. If you need to switch between two different signals (say, for different experiments) you may prefer to have one on each channel and only activate the channel you need. That way, you can keep each channel set to a particular line and level.

Note, however, that some sound cards (especially when running on Windows XP), sum the Left and Right channels together when only one is active, and cut the sensitivity in half.

If your card doesn't allow input and output to be synchronized, you can use a second input to monitor an output line. Then you can use a conventional trigger to keep the display synchronized for viewing and synchronous averaging. See Full-Duplex Techniques for more details.

You must have at least one of these buttons active to be able to toggle Input on, or you will get a message to 'Select Left and/or Right Input channel'.

Macro Notes:

InL=1 turns the Left Input channel on, InL=0 turns it off, and InL=x toggles between the two states. InR operates the same way for the Right channel.

See also Input Control Dialog