MPM Performance Rendering Pipeline

As implemented in the official MPM API as part of meico, method meico.mpm.elements.Performance.perform().

Definitions

Term	Items covered
All global MSM maps	keySignatureMap, timeSignatureMap, sectionMap, sequencingMap, markerMap, pedalMap
All local MSM maps for each MSM part includes	score, keySignatureMap, timeSignatureMap, sectionMap, sequencingMap, markerMap, programChangeMap, pedalMap

Performance Rendering Pipeline

During performance rendering, transformations are applied to MSM maps in the following sequence.

Sequence	MPM Feature	Effect
1	Temporary Attributes	the values of @date, @date.end and @duration are copied into newly added @date.perf, @date.end.perf and @duration.perf, so the original remains unaltered
2	Global Ornamentation	adds or edits modifier attributes @ornament.dynamics, @ornament.date.offset/@ornament.milliseconds.date.offset, @ornament.duration/@ornament.milliseconds.duration, @ornament.noteoff.shift for all affected MSM note elements
3	Global Rubato	all global MSM maps; modifies @date.perf
4	Global Tempo	all global MSM maps; adds @milliseconds.date and @milliseconds.date.end to each element in the map
5	Global Asynchrony	global pedalMap; modifies @milliseconds.date and @milliseconds.date.end
6	Global Timing Imprecision	global pedalMap; modifies @milliseconds.date and @milliseconds.date.end
7		For each MSM part (if a local map is given, the corresponding global map is ignored for this part)
7.1	Temporary Attributes	the values of @date, @date.end and @duration are copied into newly added @date.perf, @date.end.perf and @duration.perf, so the original remains unaltered
7.2	Dynamics	local score; adds @velocity to all note elements; this will also generate a channelVolumeMap for sub-note dynamics instructions <volume date="", date.perf="" value=""/> which is added to the MSM part's dated environment
7.3	Metrical Accentuation	local score; modifies @velocity of the note elements
7.4	Articulation (excluding milliseconds modifiers)	local score; adds or modifies @date.perf, @duration.perf, @velocity, @detuneCents, @detuneHz
7.5	Rubato	all local MSM maps modifies @date.perf
7.6	Ornamentation	adds or edits modifier attributes @ornament.dynamics, @ornament.date.offset/@ornament.milliseconds.date.offset, @ornament.duration/@ornament.milliseconds.duration, @ornament.noteoff.shift for all affected MSM note elements; renders all non-milliseconds modifiers into performance attributes @velocity, @date.perf, @date.end.perf and @duration.perf
7.7	Tempo	all local MSM maps; adds @milliseconds.date and @milliseconds.date.end to each element in the map
7.8	Asynchrony	local pedalMap; modifies @milliseconds.date and @milliseconds.date.end
7.9	Timing Imprecision	local pedalMap; modifies @milliseconds.date and @milliseconds.date.end
7.10	Tempo	local channelVolumeMap (from step 5.1); adds @milliseconds.date
7.11	Asynchrony	local channelVolumeMap (from step 5.1); modifies @milliseconds.date
7.12	Asynchrony	local score; modifies @milliseconds.date and @milliseconds.date.end
7.13	Articulation (milliseconds modifiers only)	local score; modifies @milliseconds.date, @milliseconds.date.end
7.14	Ornamentation (milliseconds modifiers only)	local score; renders @ornament.milliseconds.date.offset and @ornament.milliseconds.duration into performance attributes @milliseconds.date and @milliseconds.date.end
7.15	Timing Imprecision	local score; modifies @milliseconds.date and @milliseconds.date.end
7.16	Dynamics Imprecision	local score; modifies @velocity
7.17	Tone Duration Imprecision	local score; modifies @milliseconds.date.end
7.18	Tuning Imprecision	local score; modifies @tuning.offset
8	Cleanup	obsolete

The output is an altered and enriched MSM instance that can be exported to expressive MIDI.