Surge XT stores two independent synthesis scenes in every patch

Every Surge XT patch contains two scenes (A and B) plus an effects section. Each scene is a complete synthesizer voice chain — oscillators, filter block, envelopes, and modulation — and can be played alone, layered (Dual mode), or split across a key range. This architecture lets a single patch hold two distinct timbres simultaneously. Scene Mode options are Single, Key Split, Channel Split, and Dual. MIDI channels 2 and 3 can be used to address scenes A and B independently. Because scenes share one effects bus but have separate voice chains, patches can layer pads, lead lines, or bass/melody pairs without loading two plugin instances.

Examples

Load a pad on Scene A and a bass on Scene B; set Scene Mode to Dual to play both from one keyboard. Or use Key Split with the split at C3 to play bass below and lead above.

Assessment

Given a Surge XT patch, explain what changes when you switch Scene Mode from Single to Dual. Then describe what ‘Key Split’ does that ‘Dual’ does not.