@ethan I wanted to chime in and provide a bit more background behind how the voltage threshold works in hardware, and hopefully might further explain why you might be seeing these glitches.
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Logic Pro 8 and Logic Pro 16 employ fixed voltage threshold options with little to no hysteresis (we don’t characterize the hysteresis amount either). Typically, this means that, if the rising/falling edges have a relatively gradual slope, any inline noise might trigger these glitches (due to the little to no hysteresis around the threshold). The voltage threshold options are discussed in more detail in the support article below.
https://support.saleae.com/user-guide/supported-voltages -
The analog bandwidth on our products is much lower than the digital bandwidth, and therefore, analog captures on the same channel as the digital one may not show the high frequency noise that might be triggering the digital glitches during the rising/falling edges. We also have internal hardware and software filters that change depending on the sampling rate selected. We describe this in more detail below:
https://support.saleae.com/troubleshooting/digital-and-analog-appear-different
For the reasons above, we usually recommend enabling the glitch filter in cases like this.