Added feature flags information

sfe-latest/compatibility-specification/featureflags.md

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+# SFe Feature Flags List 4.0.10
+
+The feature flags system is split like this:
+
+- Branches: Roughly corresponds to each version (but not all listed features are part of the version). Maximum of 256. Number may increase with later SFe64 wMajor versions.
+- Leaves: Corresponds to each feature. Maximum of 256. These may change with later SFe64 wMajor versions. Contains 32-bit data declaring how much of the feature is implemented.
+- Flags: Each of the 32-bits that comprise a leaf, declaring support for specific features.
+
+## Branch 00: Foundational synthesis engine
+
+### Leaf 00:00: Tuning
+
+- Bit 1: Coarse tuning
+- Bit 2: Fine tuning
+- Bit 3: Root key
+
+### Leaf 00:01: Looping
+
+- Bit 1: Loop during release
+- Bit 2: Non-loop during release
+
+### Leaf 00:02: Filter Types
+
+- Bit 1: Sound Blaster compatible low pass
+
+### Leaf 00:03: Amplification and attenuation
+
+- Bit 1: Attenuation supported in preset
+- Bit 2: Attenuation supported in instrument
+- Bit 3: Amplification supported in preset
+- Bit 4: Amplification supported in instrument
+- Bit 5: True dB supported. If not supported, 0.4x dB is supported.
+
+### Leaf 00:04: Effects blocks
+
+- Bit 1: Reverb supported
+- Bit 2: Chorus supported
+- Bit 3: Pan supported
+
+### Leaf 00:05: Low Frequency Oscillators
+
+- Bit 1: Vibrato supported
+- Bit 2: Pitch Modulation
+- Bit 3: Filter Modulation
+- Bit 4: Amplitude Modulation
+
+### Leaf 00:06: Envelopes
+
+- Bit 1: Volume delay
+- Bit 2: Volume attack
+- Bit 3: Volume hold
+- Bit 4: Volume decay
+- Bit 5: Volume sustain
+- Bit 6: Volume release
+- Bit 7: Key to volume hold
+- Bit 8: Key to volume decay
+- Bit 9: Modulation delay
+- Bit 10: Modulation attack
+- Bit 11: Modulation hold
+- Bit 12: Modulation decay
+- Bit 13: Modulation sustain
+- Bit 14: Modulation release
+- Bit 15: Key to modulation hold
+- Bit 16: Key to modulation decay
+- Bit 17: Modulation of pitch
+- Bit 18: Modulation of filter
+
+### Leaf 00:07: MIDI Control Changes
+
+- Bit 1: 00 Bank Select MSB
+- Bit 2: 06 Data Entry MSB
+- Bit 3: 32 Bank Select LSB (Multiple banks)
+- Bit 4: 38 Data Entry LSB
+- Bit 5: 64 Sustain
+- Bit 6: 66 Soft
+- Bit 7: 67 Sostenuto
+- Bit 8: 98 NRPN LSB
+- Bit 9: 99 NRPN MSB
+- Bit 10: 100 RPN LSB
+- Bit 11: 101 RPN MSB
+- Bit 12: 120 All sound off
+- Bit 13: 121 Reset all controllers
+- Bit 14: 123 All notes off
+- Bit 15: 32 Bank Select LSB (wBank support)
+- Bit 16: Sysex changes with wPreset (4.3 and later)
+
+### Leaf 00:08: Generators
+
+- Bit 1: Index gen support
+- Bit 2: Range gen support
+- Bit 3: Substitution gen support
+- Bit 4: Sample gen support
+- Bit 5: Value gen support
+- Bit 6: PGEN support
+- Bit 7: IGEN support
+
+### Leaf 00:09: Zones
+
+- Bit 1: Key range
+- Bit 2: Velocity range
+- Bit 3: Exclusive class
+- Bit 4: Fixed key
+- Bit 5: Fixed velocity
+- Bit 6: Sample offset
+- Bit 7: Loop offset
+
+### Leaf 00:0a: SFCF support (4.2 and later)
+
+- Bit 1: Always play sample to end
+- Bit 2: DLS vel-to-vol env.atk
+- Bit 3: DLS vel-to-mod env.atk
+- Bit 4: Vibrato LFO to volume
+
+## Branch 01: Modulators and NRPN
+
+### Leaf 01:00: Modulators
+
+- Bit 1: Primary source
+- Bit 2: Secondary source
+- Bit 3: Transform support
+- Bit 4: Linear curves
+- Bit 5: Concave curves
+- Bit 6: Convex curves
+- Bit 7: Switch curves
+- Bit 8: Positive unipolar
+- Bit 9: Negative unipolar
+- Bit 10: Positive bipolar
+- Bit 11: Negative bipolar
+- Bit 12: Modulator chaining
+- Bit 13: PMOD support
+- Bit 14: IMOD support
+
+### Leaf 01:01: NRPN
+
+- Bit 1: NRPN select MSB=120
+- Bit 2: NRPN select LSB: 1-2 digits
+- Bit 3: NRPN select LSB: 3 digits
+- Bit 4: NRPN select LSB: 4 digits
+- Bit 5: NRPN select LSB: 5 digits
+
+### Leaf 01:02: DMOD chunk (4.1 and later)
+
+- Bit 1 off, bit 2 off: No support
+- Bit 1 on, bit 2 off: Read support only
+- Bit 1 on, bit 2 on: Playback support
+
+### Leaf 01:03: PNMM chunk (4.1 and later)
+
+- Bit 1 off, bit 2 off: No support
+- Bit 1 on, bit 2 off: Read support only
+- Bit 1 on, bit 2 on: Playback support
+- Bit 3: NRPN
+- Bit 4: RPN
+- Bit 5: MSB
+- Bit 6: LSB
+
+## Branch 02: Sample bitdepth support
+
+### Leaf 02:00: 24-bit support
+
+- Bit 1 off, bit 2 off: No support
+- Bit 1 on, bit 2 off: Read support only
+- Bit 1 on, bit 2 on: Playback support
+- Bit 3: 8-bit support
+
+### Leaf 02:01: 32-bit support
+
+- Bit 1 off, bit 2 off: No support
+- Bit 1 on, bit 2 off: Read support only
+- Bit 1 on, bit 2 on: Playback support
+- Bit 2: Support for combining two 8-bit chunks into a 16-bit sample
+
+## Branch 03: Compression support (WernerSF3)
+
+### Leaf 03:00: Compression flag
+
+- 0: sfSampleType bit 4 unsupported
+- 1: sfSampleType bit 4 supported
+
+### Leaf 03:01: Sample compression formats
+
+- Bit 1: OGG
+- Bit 2: Opus
+- Bit 3: FLAC
+- Bit 4: MP3
+
+## Branch 04: Metadata upgrades
+
+### Leaf 04:00: Metadata improvements
+
+- Bit 1: UTF-8 in INFO
+- Bit 2: UTF-8 in pdta
+
+### Leaf 04:01: Preset management system
+
+- Bit 1: dwLibrary support (4.4 and later)
+- Bit 2: dwGenre support (4.4 and later)
+- Bit 3: dwMorphology support (future version)