Synch. signal settings

 gives the input line used when performing a loop-back measurement. For the Digigram cards, Analog Input should be selected, but for other sound cards it is usually Mic or Line In.

 gives the channel that the loop-back is to be connected to. If the loop-back input is stereo, it is usually connected to Right channel. But if it is mono (typically the Mic input on a built-in sound card), it must be set to Left.

 should be checked if problems occur when measuring in loop-back mode. A short MLS signal will then be used for the synchronization instead of the standard pulse. This signal is less prone to noise, but may demand a faster PC since will need more processing. If you are using a sound card capable of measuring DC offset (e.g. TB Tahiti/Monterey) it is strongly recommended to use this setting.