Increasing sharpness makes the tremolo more dramatic, giving it more attack.
For triangle and ramp shapes, turning up the sharpness increases the exponential-ness of the attack and decay, making it very pulse-y and…. sharp. Turning down the sharpness produces more of a linear sound (which is what most synthesizer and effect lfos default to).
At 50% Sharpness (the default), the attack and decays of the harmonics will take the exact amount of space specified by Trem Rate.
For example, with Trem Type set to ramp, you’ll get something like:
Cranking Sharpness up gives you sharper, more distinct plucks:
The attacks will still “hit” at the same places (determined by Trem Rate and Trem Offset), but have a bit more space (their envelopes stay at 0) as you turn sharpness up.
Sharpness does not technically change the attack and decay curvature, just reduces the time they take as well as increases spacing.
For the square tremolo, the volumes are either full on or full off (at full depth). With sharpness halfway, the note is on for 50% of the time, off for 50% of the time. Increasing sharpness turns them off for a larger percentage of the time. Decreasing sharpness keeps them on for a larger percentage of the time.
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