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The FM Sync control is available whenever FM is active and the FM Source is set to Sine. When you toggle FM Sync on, it specifies that the display sync will be to the Sine modulator instead of the main (carrier) frequency. You will thus see a stationary sinusoidal modulation pattern on the main wave. Typically, an FM waveform looks like a spring being stretched and compressed; when you sync to the modulator you see a stationary spring with compressed and stretched portions.
However, FM Sync is only effective if Trigger is active and Gen Sync is selected in the Trigger dialog. When the Gen Sync button has been activated there, it changes to show the current Sync source. In this case, it will show the channel and stream plus 'FM'.
L.1.FMsync=1 sets Left Stream 1 Sync to the FM Modulator Frequency. L.1.FMsync=0 sets Sync off, and L.1.FMsync=x toggles between the two states.
Note that there is a single global Sync source, not separate sources for each channel or stream. The L.1. channel and stream prefixes select which stream will be chosen as the Sync source. When FMsync goes from on to off, the global sync reverts to the Left Stream 0 Tone Frequency until you set it to something else.
Note: If a FMsync command is given when the FM Dialog is open for any channel or stream, and the control is disabled in that dialog, then the macro will abort with an error message... regardless of which channel or stream is the target of the command. You can however, safely test FMsync with an IF statement.
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