DSP-Only Parameters
The VL3X firmware contains more capability than its screen reveals. DSP-only parameters are processed by the hardware's digital signal processor but have no corresponding control on the device's own UI. They exist in the firmware's preset memory and affect audio output, but TC-Helicon chose not to surface them on the hardware interface.
Why do they exist? The SHARC DSP running the VL3X's audio engine has many algorithm parameters that would clutter the hardware's screen. TC-Helicon exposed a curated subset for the hardware UI while leaving the rest accessible only through SysEx. Pilot reads and writes these parameters directly over MIDI, giving you control that was previously impossible without custom software.
DSP-only parameters are not stored in the preset binary. They are sent directly to the DSP engine. Most of them are firmware-level globals: a value set from Pilot stays when you change presets. Three are set by each preset instead, Comp Threshold (Guitar DSP), Clock Length (Metronome) and Delay to Reverb Feed: they change when the preset changes, and Pilot cannot save them. Use the 92 Hidden Parameters guide for a broader look at what Pilot exposes that the VL3X hardware does not. DSP-only entries are also marked with a DSP-only badge throughout the Glossary.