Source presets store media state separately from VPT presets, so mapping and content recall independently

VPT has two preset systems. A VPT preset stores the whole session — layer geometry, masks, source assignments and source playback. A source preset stores only the state of the eight source banks: which clip is selected in each, playback speed, loop type, crossfade time. By default every VPT preset auto-creates a matching source preset (numbered from 1001). Separating them is useful when the mapping is fixed and only the content changes: keep one VPT preset for the layers/masks and drive the rest with source presets. To enable that workflow you edit prefs.txt — disable ‘autosource’ so source presets are not auto-created, and enable ‘xfadelocal’ so each source’s own crossfade time is used instead of the cuelist’s.

Examples

A permanent install has one fixed VPT preset (the mapping) and source presets 1–10 that cycle through different video sequences without ever touching layer geometry.

Assessment

Describe a performance where separating source presets from VPT presets helps. Which two prefs.txt settings enable it, and what does each do?