What is a primary characteristic of modulating pitch with LFO 1 in Logic Pro?

Modulating pitch with an LFO (Low-Frequency Oscillator) primarily impacts the pitch of a sound over time, resulting in a rhythmic pulse effect. By setting the LFO to alter pitch, you introduce variations at a set frequency, which can create fluctuations that are perceived as movement or vibrato in the sound. This modulation can add depth and interest to audio tracks, especially in music production, where rhythmic and tonal dynamics are essential for engagement.

While other options pertain to possible effects in audio processing, they do not directly reflect how an LFO modulating pitch operates. For example, changing the duration of a sample refers to time-stretching, and enhancing the reverb effect involves altering the spatial characteristics of the sound rather than its pitch. Additionally, affecting visual representation would imply that the modulation impacts only how the sound looks on a screen rather than how it sounds, which is not the case with pitch modulation through an LFO. Therefore, the creation of a rhythmic pulse effect is the primary characteristic associated with pitch modulation using an LFO.