Intensity knob and field: Set the amount of amplitude modulation.
Stereo knob and field: Determine the relative phase shift between the left and right channels.
A value of 0 changes the level of both channels—in phase.
A value of 180 (out-of-phase modulation), results in a stereo tremolo effect that is also known as auto panning. This is similar to manually turning the pan pot from side to side.
Tip: The original Wurlitzer Piano has a mono tremolo with a fixed modulation rate of 5.5 Hz. For an authentic Wurlitzer sound, select a Stereo value of 0 degrees. For Rhodes sounds, set the Stereo value to 180 degrees. The settings in between result in spacious effects—especially when low Rate knob values are used.
Download the guides:
Logic Pro User Guide: PDF