const
  ALC_EXT_EFX_NAME = 'ALC_EXT_EFX'; 
  ALC_EFX_MAJOR_VERSION = $20001; 
  ALC_EFX_MINOR_VERSION = $20002; 
  ALC_MAX_AUXILIARY_SENDS = $20003; 
  (* Listener properties. *)
  AL_METERS_PER_UNIT = $20004; 
  (* Source properties. *)
  AL_DIRECT_FILTER = $20005; 
  AL_AUXILIARY_SEND_FILTER = $20006; 
  AL_AIR_ABSORPTION_FACTOR = $20007; 
  AL_ROOM_ROLLOFF_FACTOR = $20008; 
  AL_CONE_OUTER_GAINHF = $20009; 
  AL_DIRECT_FILTER_GAINHF_AUTO = $2000A; 
  AL_AUXILIARY_SEND_FILTER_GAIN_AUTO = $2000B; 
  AL_AUXILIARY_SEND_FILTER_GAINHF_AUTO = $2000C; 
  (* Effect properties. *)
  (* Reverb effect parameters *)
  AL_REVERB_DENSITY = $0001; 
  AL_REVERB_DIFFUSION = $0002; 
  AL_REVERB_GAIN = $0003; 
  AL_REVERB_GAINHF = $0004; 
  AL_REVERB_DECAY_TIME = $0005; 
  AL_REVERB_DECAY_HFRATIO = $0006; 
  AL_REVERB_REFLECTIONS_GAIN = $0007; 
  AL_REVERB_REFLECTIONS_DELAY = $0008; 
  AL_REVERB_LATE_REVERB_GAIN = $0009; 
  AL_REVERB_LATE_REVERB_DELAY = $000A; 
  AL_REVERB_AIR_ABSORPTION_GAINHF = $000B; 
  AL_REVERB_ROOM_ROLLOFF_FACTOR = $000C; 
  AL_REVERB_DECAY_HFLIMIT = $000D; 
  (* EAX Reverb effect parameters *)
  AL_EAXREVERB_DENSITY = $0001; 
  AL_EAXREVERB_DIFFUSION = $0002; 
  AL_EAXREVERB_GAIN = $0003; 
  AL_EAXREVERB_GAINHF = $0004; 
  AL_EAXREVERB_GAINLF = $0005; 
  AL_EAXREVERB_DECAY_TIME = $0006; 
  AL_EAXREVERB_DECAY_HFRATIO = $0007; 
  AL_EAXREVERB_DECAY_LFRATIO = $0008; 
  AL_EAXREVERB_REFLECTIONS_GAIN = $0009; 
  AL_EAXREVERB_REFLECTIONS_DELAY = $000A; 
  AL_EAXREVERB_REFLECTIONS_PAN = $000B; 
  AL_EAXREVERB_LATE_REVERB_GAIN = $000C; 
  AL_EAXREVERB_LATE_REVERB_DELAY = $000D; 
  AL_EAXREVERB_LATE_REVERB_PAN = $000E; 
  AL_EAXREVERB_ECHO_TIME = $000F; 
  AL_EAXREVERB_ECHO_DEPTH = $0010; 
  AL_EAXREVERB_MODULATION_TIME = $0011; 
  AL_EAXREVERB_MODULATION_DEPTH = $0012; 
  AL_EAXREVERB_AIR_ABSORPTION_GAINHF = $0013; 
  AL_EAXREVERB_HFREFERENCE = $0014; 
  AL_EAXREVERB_LFREFERENCE = $0015; 
  AL_EAXREVERB_ROOM_ROLLOFF_FACTOR = $0016; 
  AL_EAXREVERB_DECAY_HFLIMIT = $0017; 
  (* Chorus effect parameters *)
  AL_CHORUS_WAVEFORM = $0001; 
  AL_CHORUS_PHASE = $0002; 
  AL_CHORUS_RATE = $0003; 
  AL_CHORUS_DEPTH = $0004; 
  AL_CHORUS_FEEDBACK = $0005; 
  AL_CHORUS_DELAY = $0006; 
  (* Distortion effect parameters *)
  AL_DISTORTION_EDGE = $0001; 
  AL_DISTORTION_GAIN = $0002; 
  AL_DISTORTION_LOWPASS_CUTOFF = $0003; 
  AL_DISTORTION_EQCENTER = $0004; 
  AL_DISTORTION_EQBANDWIDTH = $0005; 
  (* Echo effect parameters *)
  AL_ECHO_DELAY = $0001; 
  AL_ECHO_LRDELAY = $0002; 
  AL_ECHO_DAMPING = $0003; 
  AL_ECHO_FEEDBACK = $0004; 
  AL_ECHO_SPREAD = $0005; 
  (* Flanger effect parameters *)
  AL_FLANGER_WAVEFORM = $0001; 
  AL_FLANGER_PHASE = $0002; 
  AL_FLANGER_RATE = $0003; 
  AL_FLANGER_DEPTH = $0004; 
  AL_FLANGER_FEEDBACK = $0005; 
  AL_FLANGER_DELAY = $0006; 
  (* Frequency shifter effect parameters *)
  AL_FREQUENCY_SHIFTER_FREQUENCY = $0001; 
  AL_FREQUENCY_SHIFTER_LEFT_DIRECTION = $0002; 
  AL_FREQUENCY_SHIFTER_RIGHT_DIRECTION = $0003; 
  (* Vocal morpher effect parameters *)
  AL_VOCAL_MORPHER_PHONEMEA = $0001; 
  AL_VOCAL_MORPHER_PHONEMEA_COARSE_TUNING = $0002; 
  AL_VOCAL_MORPHER_PHONEMEB = $0003; 
  AL_VOCAL_MORPHER_PHONEMEB_COARSE_TUNING = $0004; 
  AL_VOCAL_MORPHER_WAVEFORM = $0005; 
  AL_VOCAL_MORPHER_RATE = $0006; 
  (* Pitchshifter effect parameters *)
  AL_PITCH_SHIFTER_COARSE_TUNE = $0001; 
  AL_PITCH_SHIFTER_FINE_TUNE = $0002; 
  (* Ringmodulator effect parameters *)
  AL_RING_MODULATOR_FREQUENCY = $0001; 
  AL_RING_MODULATOR_HIGHPASS_CUTOFF = $0002; 
  AL_RING_MODULATOR_WAVEFORM = $0003; 
  (* Autowah effect parameters *)
  AL_AUTOWAH_ATTACK_TIME = $0001; 
  AL_AUTOWAH_RELEASE_TIME = $0002; 
  AL_AUTOWAH_RESONANCE = $0003; 
  AL_AUTOWAH_PEAK_GAIN = $0004; 
  (* Compressor effect parameters *)
  AL_COMPRESSOR_ONOFF = $0001; 
  (* Equalizer effect parameters *)
  AL_EQUALIZER_LOW_GAIN = $0001; 
  AL_EQUALIZER_LOW_CUTOFF = $0002; 
  AL_EQUALIZER_MID1_GAIN = $0003; 
  AL_EQUALIZER_MID1_CENTER = $0004; 
  AL_EQUALIZER_MID1_WIDTH = $0005; 
  AL_EQUALIZER_MID2_GAIN = $0006; 
  AL_EQUALIZER_MID2_CENTER = $0007; 
  AL_EQUALIZER_MID2_WIDTH = $0008; 
  AL_EQUALIZER_HIGH_GAIN = $0009; 
  AL_EQUALIZER_HIGH_CUTOFF = $000A; 
  (* Effect type *)
  AL_EFFECT_FIRST_PARAMETER = $0000; 
  AL_EFFECT_LAST_PARAMETER = $8000; 
  AL_EFFECT_TYPE = $8001; 
  (* Effect types, used with the AL_EFFECT_TYPE property *)
  AL_EFFECT_NULL = $0000; 
  AL_EFFECT_REVERB = $0001; 
  AL_EFFECT_CHORUS = $0002; 
  AL_EFFECT_DISTORTION = $0003; 
  AL_EFFECT_ECHO = $0004; 
  AL_EFFECT_FLANGER = $0005; 
  AL_EFFECT_FREQUENCY_SHIFTER = $0006; 
  AL_EFFECT_VOCAL_MORPHER = $0007; 
  AL_EFFECT_PITCH_SHIFTER = $0008; 
  AL_EFFECT_RING_MODULATOR = $0009; 
  AL_EFFECT_AUTOWAH = $000A; 
  AL_EFFECT_COMPRESSOR = $000B; 
  AL_EFFECT_EQUALIZER = $000C; 
  AL_EFFECT_EAXREVERB = $8000; 
  (* Auxiliary Effect Slot properties. *)
  AL_EFFECTSLOT_EFFECT = $0001; 
  AL_EFFECTSLOT_GAIN = $0002; 
  AL_EFFECTSLOT_AUXILIARY_SEND_AUTO = $0003; 
  (* NULL Auxiliary Slot ID to disable a source send. *)
  AL_EFFECTSLOT_NULL = $0000; 
  (* Filter properties. *)
  (* Lowpass filter parameters *)
  AL_LOWPASS_GAIN = $0001; 
  AL_LOWPASS_GAINHF = $0002; 
  (* Highpass filter parameters *)
  AL_HIGHPASS_GAIN = $0001; 
  AL_HIGHPASS_GAINLF = $0002; 
  (* Bandpass filter parameters *)
  AL_BANDPASS_GAIN = $0001; 
  AL_BANDPASS_GAINLF = $0002; 
  AL_BANDPASS_GAINHF = $0003; 
  (* Filter type *)
  AL_FILTER_FIRST_PARAMETER = $0000; 
  AL_FILTER_LAST_PARAMETER = $8000; 
  AL_FILTER_TYPE = $8001; 
  (* Filter types, used with the AL_FILTER_TYPE property *)
  AL_FILTER_NULL = $0000; 
  AL_FILTER_LOWPASS = $0001; 
  AL_FILTER_HIGHPASS = $0002; 
  AL_FILTER_BANDPASS = $0003; 

const
  (* Filter ranges and defaults. *)
  (* Lowpass filter *)
  AL_LOWPASS_MIN_GAIN = 0.0; 
  AL_LOWPASS_MAX_GAIN = 1.0; 
  AL_LOWPASS_DEFAULT_GAIN = 1.0; 
  AL_LOWPASS_MIN_GAINHF = 0.0; 
  AL_LOWPASS_MAX_GAINHF = 1.0; 
  AL_LOWPASS_DEFAULT_GAINHF = 1.0; 
  (* Highpass filter *)
  AL_HIGHPASS_MIN_GAIN = 0.0; 
  AL_HIGHPASS_MAX_GAIN = 1.0; 
  AL_HIGHPASS_DEFAULT_GAIN = 1.0; 
  AL_HIGHPASS_MIN_GAINLF = 0.0; 
  AL_HIGHPASS_MAX_GAINLF = 1.0; 
  AL_HIGHPASS_DEFAULT_GAINLF = 1.0; 
  (* Bandpass filter *)
  AL_BANDPASS_MIN_GAIN = 0.0; 
  AL_BANDPASS_MAX_GAIN = 1.0; 
  AL_BANDPASS_DEFAULT_GAIN = 1.0; 
  AL_BANDPASS_MIN_GAINHF = 0.0; 
  AL_BANDPASS_MAX_GAINHF = 1.0; 
  AL_BANDPASS_DEFAULT_GAINHF = 1.0; 
  AL_BANDPASS_MIN_GAINLF = 0.0; 
  AL_BANDPASS_MAX_GAINLF = 1.0; 
  AL_BANDPASS_DEFAULT_GAINLF = 1.0; 
  (* Effect parameter ranges and defaults. *)
  (* Standard reverb effect *)
  AL_REVERB_MIN_DENSITY = 0.0; 
  AL_REVERB_MAX_DENSITY = 1.0; 
  AL_REVERB_DEFAULT_DENSITY = 1.0; 
  AL_REVERB_MIN_DIFFUSION = 0.0; 
  AL_REVERB_MAX_DIFFUSION = 1.0; 
  AL_REVERB_DEFAULT_DIFFUSION = 1.0; 
  AL_REVERB_MIN_GAIN = 0.0; 
  AL_REVERB_MAX_GAIN = 1.0; 
  AL_REVERB_DEFAULT_GAIN = 0.32; 
  AL_REVERB_MIN_GAINHF = 0.0; 
  AL_REVERB_MAX_GAINHF = 1.0; 
  AL_REVERB_DEFAULT_GAINHF = 0.89; 
  AL_REVERB_MIN_DECAY_TIME = 0.1; 
  AL_REVERB_MAX_DECAY_TIME = 20.0; 
  AL_REVERB_DEFAULT_DECAY_TIME = 1.49; 
  AL_REVERB_MIN_DECAY_HFRATIO = 0.1; 
  AL_REVERB_MAX_DECAY_HFRATIO = 2.0; 
  AL_REVERB_DEFAULT_DECAY_HFRATIO = 0.83; 
  AL_REVERB_MIN_REFLECTIONS_GAIN = 0.0; 
  AL_REVERB_MAX_REFLECTIONS_GAIN = 3.16; 
  AL_REVERB_DEFAULT_REFLECTIONS_GAIN = 0.5; 
  AL_REVERB_MIN_REFLECTIONS_DELAY = 0.0; 
  AL_REVERB_MAX_REFLECTIONS_DELAY = 0.3; 
  AL_REVERB_DEFAULT_REFLECTIONS_DELAY = 0.7; 
  AL_REVERB_MIN_LATE_REVERB_GAIN = 0.0; 
  AL_REVERB_MAX_LATE_REVERB_GAIN = 10.0; 
  AL_REVERB_DEFAULT_LATE_REVERB_GAIN = 1.26; 
  AL_REVERB_MIN_LATE_REVERB_DELAY = 0.0; 
  AL_REVERB_MAX_LATE_REVERB_DELAY = 0.1; 
  AL_REVERB_DEFAULT_LATE_REVERB_DELAY = 0.9; 
  AL_REVERB_MIN_AIR_ABSORPTION_GAINHF = 0.892; 
  AL_REVERB_MAX_AIR_ABSORPTION_GAINHF = 1.0; 
  AL_REVERB_DEFAULT_AIR_ABSORPTION_GAINHF = 0.994; 
  AL_REVERB_MIN_ROOM_ROLLOFF_FACTOR = 0.0; 
  AL_REVERB_MAX_ROOM_ROLLOFF_FACTOR = 10.0; 
  AL_REVERB_DEFAULT_ROOM_ROLLOFF_FACTOR = 0.0; 
  AL_REVERB_MIN_DECAY_HFLIMIT = AL_FALSE; 
  AL_REVERB_MAX_DECAY_HFLIMIT = AL_TRUE; 
  AL_REVERB_DEFAULT_DECAY_HFLIMIT = AL_TRUE; 
  (* EAX reverb effect *)
  AL_EAXREVERB_MIN_DENSITY = 0.0; 
  AL_EAXREVERB_MAX_DENSITY = 1.0; 
  AL_EAXREVERB_DEFAULT_DENSITY = 1.0; 
  AL_EAXREVERB_MIN_DIFFUSION = 0.0; 
  AL_EAXREVERB_MAX_DIFFUSION = 1.0; 
  AL_EAXREVERB_DEFAULT_DIFFUSION = 1.0; 
  AL_EAXREVERB_MIN_GAIN = 0.0; 
  AL_EAXREVERB_MAX_GAIN = 1.0; 
  AL_EAXREVERB_DEFAULT_GAIN = 0.32; 
  AL_EAXREVERB_MIN_GAINHF = 0.0; 
  AL_EAXREVERB_MAX_GAINHF = 1.0; 
  AL_EAXREVERB_DEFAULT_GAINHF = 0.89; 
  AL_EAXREVERB_MIN_GAINLF = 0.0; 
  AL_EAXREVERB_MAX_GAINLF = 1.0; 
  AL_EAXREVERB_DEFAULT_GAINLF = 1.0; 
  AL_EAXREVERB_MIN_DECAY_TIME = 0.1; 
  AL_EAXREVERB_MAX_DECAY_TIME = 20.0; 
  AL_EAXREVERB_DEFAULT_DECAY_TIME = 1.49; 
  AL_EAXREVERB_MIN_DECAY_HFRATIO = 0.1; 
  AL_EAXREVERB_MAX_DECAY_HFRATIO = 2.0; 
  AL_EAXREVERB_DEFAULT_DECAY_HFRATIO = 0.83; 
  AL_EAXREVERB_MIN_DECAY_LFRATIO = 0.1; 
  AL_EAXREVERB_MAX_DECAY_LFRATIO = 2.0; 
  AL_EAXREVERB_DEFAULT_DECAY_LFRATIO = 1.0; 
  AL_EAXREVERB_MIN_REFLECTIONS_GAIN = 0.0; 
  AL_EAXREVERB_MAX_REFLECTIONS_GAIN = 3.16; 
  AL_EAXREVERB_DEFAULT_REFLECTIONS_GAIN = 0.5; 
  AL_EAXREVERB_MIN_REFLECTIONS_DELAY = 0.0; 
  AL_EAXREVERB_MAX_REFLECTIONS_DELAY = 0.3; 
  AL_EAXREVERB_DEFAULT_REFLECTIONS_DELAY = 0.7; 
  AL_EAXREVERB_DEFAULT_REFLECTIONS_PAN_XYZ = 0.0; 
  AL_EAXREVERB_MIN_LATE_REVERB_GAIN = 0.0; 
  AL_EAXREVERB_MAX_LATE_REVERB_GAIN = 10.0; 
  AL_EAXREVERB_DEFAULT_LATE_REVERB_GAIN = 1.26; 
  AL_EAXREVERB_MIN_LATE_REVERB_DELAY = 0.0; 
  AL_EAXREVERB_MAX_LATE_REVERB_DELAY = 0.1; 
  AL_EAXREVERB_DEFAULT_LATE_REVERB_DELAY = 0.9; 
  AL_EAXREVERB_DEFAULT_LATE_REVERB_PAN_XYZ = 0.0; 
  AL_EAXREVERB_MIN_ECHO_TIME = 0.3;
  AL_EAXREVERB_MAX_ECHO_TIME = 0.25; 
  AL_EAXREVERB_DEFAULT_ECHO_TIME = 0.25; 
  AL_EAXREVERB_MIN_ECHO_DEPTH = 0.0; 
  AL_EAXREVERB_MAX_ECHO_DEPTH = 1.0; 
  AL_EAXREVERB_DEFAULT_ECHO_DEPTH = 0.0; 
  AL_EAXREVERB_MIN_MODULATION_TIME = 0.4; 
  AL_EAXREVERB_MAX_MODULATION_TIME = 4.0; 
  AL_EAXREVERB_DEFAULT_MODULATION_TIME = 0.25; 
  AL_EAXREVERB_MIN_MODULATION_DEPTH = 0.0; 
  AL_EAXREVERB_MAX_MODULATION_DEPTH = 1.0; 
  AL_EAXREVERB_DEFAULT_MODULATION_DEPTH = 0.0; 
  AL_EAXREVERB_MIN_AIR_ABSORPTION_GAINHF = 0.892; 
  AL_EAXREVERB_MAX_AIR_ABSORPTION_GAINHF = 1.0; 
  AL_EAXREVERB_DEFAULT_AIR_ABSORPTION_GAINHF = 0.994; 
  AL_EAXREVERB_MIN_HFREFERENCE = 1000.0; 
  AL_EAXREVERB_MAX_HFREFERENCE = 20000.0; 
  AL_EAXREVERB_DEFAULT_HFREFERENCE = 5000.0; 
  AL_EAXREVERB_MIN_LFREFERENCE = 20.0; 
  AL_EAXREVERB_MAX_LFREFERENCE = 1000.0; 
  AL_EAXREVERB_DEFAULT_LFREFERENCE = 250.0; 
  AL_EAXREVERB_MIN_ROOM_ROLLOFF_FACTOR = 0.0; 
  AL_EAXREVERB_MAX_ROOM_ROLLOFF_FACTOR = 10.0; 
  AL_EAXREVERB_DEFAULT_ROOM_ROLLOFF_FACTOR = 0.0; 
  AL_EAXREVERB_MIN_DECAY_HFLIMIT = AL_FALSE; 
  AL_EAXREVERB_MAX_DECAY_HFLIMIT = AL_TRUE; 
  AL_EAXREVERB_DEFAULT_DECAY_HFLIMIT = AL_TRUE; 
  (* Chorus effect *)
  AL_CHORUS_WAVEFORM_SINUSOID = 0; 
  AL_CHORUS_WAVEFORM_TRIANGLE = 1; 
  AL_CHORUS_MIN_WAVEFORM = 0; 
  AL_CHORUS_MAX_WAVEFORM = 1; 
  AL_CHORUS_DEFAULT_WAVEFORM = 1; 
  AL_CHORUS_MIN_PHASE = -180; 
  AL_CHORUS_MAX_PHASE = 180; 
  AL_CHORUS_DEFAULT_PHASE = 90; 
  AL_CHORUS_MIN_RATE = 0.0; 
  AL_CHORUS_MAX_RATE = 10.0; 
  AL_CHORUS_DEFAULT_RATE = 1.1; 
  AL_CHORUS_MIN_DEPTH = 0.0; 
  AL_CHORUS_MAX_DEPTH = 1.0; 
  AL_CHORUS_DEFAULT_DEPTH = 0.1; 
  AL_CHORUS_MIN_FEEDBACK = -1.0; 
  AL_CHORUS_MAX_FEEDBACK = 1.0; 
  AL_CHORUS_DEFAULT_FEEDBACK = 0.25; 
  AL_CHORUS_MIN_DELAY = 0.0; 
  AL_CHORUS_MAX_DELAY = 0.016; 
  AL_CHORUS_DEFAULT_DELAY = 0.016; 
  (* Distortion effect *)
  AL_DISTORTION_MIN_EDGE = 0.0; 
  AL_DISTORTION_MAX_EDGE = 1.0; 
  AL_DISTORTION_DEFAULT_EDGE = 0.2; 
  AL_DISTORTION_MIN_GAIN = 0.1; 
  AL_DISTORTION_MAX_GAIN = 1.0; 
  AL_DISTORTION_DEFAULT_GAIN = 0.5; 
  AL_DISTORTION_MIN_LOWPASS_CUTOFF = 80.0; 
  AL_DISTORTION_MAX_LOWPASS_CUTOFF = 24000.0; 
  AL_DISTORTION_DEFAULT_LOWPASS_CUTOFF = 8000.0; 
  AL_DISTORTION_MIN_EQCENTER = 80.0; 
  AL_DISTORTION_MAX_EQCENTER = 24000.0; 
  AL_DISTORTION_DEFAULT_EQCENTER = 3600.0; 
  AL_DISTORTION_MIN_EQBANDWIDTH = 80.0; 
  AL_DISTORTION_MAX_EQBANDWIDTH = 24000.0; 
  AL_DISTORTION_DEFAULT_EQBANDWIDTH = 3600.0; 
  (* Echo effect *)
  AL_ECHO_MIN_DELAY = 0.0; 
  AL_ECHO_MAX_DELAY = 0.207; 
  AL_ECHO_DEFAULT_DELAY = 0.1; 
  AL_ECHO_MIN_LRDELAY = 0.0; 
  AL_ECHO_MAX_LRDELAY = 0.404; 
  AL_ECHO_DEFAULT_LRDELAY = 0.1; 
  AL_ECHO_MIN_DAMPING = 0.0; 
  AL_ECHO_MAX_DAMPING = 0.99; 
  AL_ECHO_DEFAULT_DAMPING = 0.5; 
  AL_ECHO_MIN_FEEDBACK = 0.0; 
  AL_ECHO_MAX_FEEDBACK = 1.0; 
  AL_ECHO_DEFAULT_FEEDBACK = 0.5; 
  AL_ECHO_MIN_SPREAD = -1.0; 
  AL_ECHO_MAX_SPREAD = 1.0; 
  AL_ECHO_DEFAULT_SPREAD = -1.0; 
  (* Flanger effect *)
  AL_FLANGER_WAVEFORM_SINUSOID = 0; 
  AL_FLANGER_WAVEFORM_TRIANGLE = 1; 
  AL_FLANGER_MIN_WAVEFORM = 0; 
  AL_FLANGER_MAX_WAVEFORM = 1; 
  AL_FLANGER_DEFAULT_WAVEFORM = 1; 
  AL_FLANGER_MIN_PHASE = -180; 
  AL_FLANGER_MAX_PHASE = 180; 
  AL_FLANGER_DEFAULT_PHASE = 0; 
  AL_FLANGER_MIN_RATE = 0.0; 
  AL_FLANGER_MAX_RATE = 10.0; 
  AL_FLANGER_DEFAULT_RATE = 0.27; 
  AL_FLANGER_MIN_DEPTH = 0.0; 
  AL_FLANGER_MAX_DEPTH = 1.0; 
  AL_FLANGER_DEFAULT_DEPTH = 1.0; 
  AL_FLANGER_MIN_FEEDBACK = -1.0; 
  AL_FLANGER_MAX_FEEDBACK = 1.0; 
  AL_FLANGER_DEFAULT_FEEDBACK = -0.5; 
  AL_FLANGER_MIN_DELAY = 0.0; 
  AL_FLANGER_MAX_DELAY = 0.4; 
  AL_FLANGER_DEFAULT_DELAY = 0.2; 
  (* Frequency shifter effect *)
  AL_FREQUENCY_SHIFTER_MIN_FREQUENCY = 0.0; 
  AL_FREQUENCY_SHIFTER_MAX_FREQUENCY = 24000.0; 
  AL_FREQUENCY_SHIFTER_DEFAULT_FREQUENCY = 0.0; 
  AL_FREQUENCY_SHIFTER_MIN_LEFT_DIRECTION = 0; 
  AL_FREQUENCY_SHIFTER_MAX_LEFT_DIRECTION = 2; 
  AL_FREQUENCY_SHIFTER_DEFAULT_LEFT_DIRECTION = 0; 
  AL_FREQUENCY_SHIFTER_DIRECTION_DOWN = 0; 
  AL_FREQUENCY_SHIFTER_DIRECTION_UP = 1; 
  AL_FREQUENCY_SHIFTER_DIRECTION_OFF = 2; 
  AL_FREQUENCY_SHIFTER_MIN_RIGHT_DIRECTION = 0; 
  AL_FREQUENCY_SHIFTER_MAX_RIGHT_DIRECTION = 2; 
  AL_FREQUENCY_SHIFTER_DEFAULT_RIGHT_DIRECTION = 0; 
  (* Vocal morpher effect *)
  AL_VOCAL_MORPHER_MIN_PHONEMEA = 0; 
  AL_VOCAL_MORPHER_MAX_PHONEMEA = 29; 
  AL_VOCAL_MORPHER_DEFAULT_PHONEMEA = 0; 
  AL_VOCAL_MORPHER_MIN_PHONEMEA_COARSE_TUNING = -24; 
  AL_VOCAL_MORPHER_MAX_PHONEMEA_COARSE_TUNING = 24; 
  AL_VOCAL_MORPHER_DEFAULT_PHONEMEA_COARSE_TUNING = 0; 
  AL_VOCAL_MORPHER_MIN_PHONEMEB = 0; 
  AL_VOCAL_MORPHER_MAX_PHONEMEB = 29; 
  AL_VOCAL_MORPHER_DEFAULT_PHONEMEB = 10; 
  AL_VOCAL_MORPHER_MIN_PHONEMEB_COARSE_TUNING = -24; 
  AL_VOCAL_MORPHER_MAX_PHONEMEB_COARSE_TUNING = 24; 
  AL_VOCAL_MORPHER_DEFAULT_PHONEMEB_COARSE_TUNING = 0; 
  AL_VOCAL_MORPHER_PHONEME_A = 0; 
  AL_VOCAL_MORPHER_PHONEME_E = 1; 
  AL_VOCAL_MORPHER_PHONEME_I = 2; 
  AL_VOCAL_MORPHER_PHONEME_O = 3; 
  AL_VOCAL_MORPHER_PHONEME_U = 4; 
  AL_VOCAL_MORPHER_PHONEME_AA = 5; 
  AL_VOCAL_MORPHER_PHONEME_AE = 6; 
  AL_VOCAL_MORPHER_PHONEME_AH = 7; 
  AL_VOCAL_MORPHER_PHONEME_AO = 8; 
  AL_VOCAL_MORPHER_PHONEME_EH = 9; 
  AL_VOCAL_MORPHER_PHONEME_ER = 10; 
  AL_VOCAL_MORPHER_PHONEME_IH = 11; 
  AL_VOCAL_MORPHER_PHONEME_IY = 12; 
  AL_VOCAL_MORPHER_PHONEME_UH = 13; 
  AL_VOCAL_MORPHER_PHONEME_UW = 14; 
  AL_VOCAL_MORPHER_PHONEME_B = 15; 
  AL_VOCAL_MORPHER_PHONEME_D = 16; 
  AL_VOCAL_MORPHER_PHONEME_F = 17; 
  AL_VOCAL_MORPHER_PHONEME_G = 18; 
  AL_VOCAL_MORPHER_PHONEME_J = 19; 
  AL_VOCAL_MORPHER_PHONEME_K = 20; 
  AL_VOCAL_MORPHER_PHONEME_L = 21; 
  AL_VOCAL_MORPHER_PHONEME_M = 22; 
  AL_VOCAL_MORPHER_PHONEME_N = 23; 
  AL_VOCAL_MORPHER_PHONEME_P = 24; 
  AL_VOCAL_MORPHER_PHONEME_R = 25; 
  AL_VOCAL_MORPHER_PHONEME_S = 26; 
  AL_VOCAL_MORPHER_PHONEME_T = 27; 
  AL_VOCAL_MORPHER_PHONEME_V = 28; 
  AL_VOCAL_MORPHER_PHONEME_Z = 29; 
  AL_VOCAL_MORPHER_WAVEFORM_SINUSOID = 0; 
  AL_VOCAL_MORPHER_WAVEFORM_TRIANGLE = 1; 
  AL_VOCAL_MORPHER_WAVEFORM_SAWTOOTH = 2; 
  AL_VOCAL_MORPHER_MIN_WAVEFORM = 0; 
  AL_VOCAL_MORPHER_MAX_WAVEFORM = 2; 
  AL_VOCAL_MORPHER_DEFAULT_WAVEFORM = 0; 
  AL_VOCAL_MORPHER_MIN_RATE = 0.0; 
  AL_VOCAL_MORPHER_MAX_RATE = 10.0; 
  AL_VOCAL_MORPHER_DEFAULT_RATE = 1.41; 
  (* Pitch shifter effect *)
  AL_PITCH_SHIFTER_MIN_COARSE_TUNE = -12; 
  AL_PITCH_SHIFTER_MAX_COARSE_TUNE = 12; 
  AL_PITCH_SHIFTER_DEFAULT_COARSE_TUNE = 12; 
  AL_PITCH_SHIFTER_MIN_FINE_TUNE = -50; 
  AL_PITCH_SHIFTER_MAX_FINE_TUNE = 50; 
  AL_PITCH_SHIFTER_DEFAULT_FINE_TUNE = 0; 
  (* Ring modulator effect *)
  AL_RING_MODULATOR_MIN_FREQUENCY = 0.0; 
  AL_RING_MODULATOR_MAX_FREQUENCY = 8000.0; 
  AL_RING_MODULATOR_DEFAULT_FREQUENCY = 440.0; 
  AL_RING_MODULATOR_MIN_HIGHPASS_CUTOFF = 0.0; 
  AL_RING_MODULATOR_MAX_HIGHPASS_CUTOFF = 24000.0; 
  AL_RING_MODULATOR_DEFAULT_HIGHPASS_CUTOFF = 800.0; 
  AL_RING_MODULATOR_SINUSOID = 0; 
  AL_RING_MODULATOR_SAWTOOTH = 1; 
  AL_RING_MODULATOR_SQUARE = 2; 
  AL_RING_MODULATOR_MIN_WAVEFORM = 0; 
  AL_RING_MODULATOR_MAX_WAVEFORM = 2; 
  AL_RING_MODULATOR_DEFAULT_WAVEFORM = 0; 
  (* Autowah effect *)
  AL_AUTOWAH_MIN_ATTACK_TIME = 0.1; 
  AL_AUTOWAH_MAX_ATTACK_TIME = 1.0; 
  AL_AUTOWAH_DEFAULT_ATTACK_TIME = 0.6; 
  AL_AUTOWAH_MIN_RELEASE_TIME = 0.1; 
  AL_AUTOWAH_MAX_RELEASE_TIME = 1.0; 
  AL_AUTOWAH_DEFAULT_RELEASE_TIME = 0.6; 
  AL_AUTOWAH_MIN_RESONANCE = 2.0; 
  AL_AUTOWAH_MAX_RESONANCE = 1000.0; 
  AL_AUTOWAH_DEFAULT_RESONANCE = 1000.0; 
  AL_AUTOWAH_MIN_PEAK_GAIN = 0.3; 
  AL_AUTOWAH_MAX_PEAK_GAIN = 31621.0; 
  AL_AUTOWAH_DEFAULT_PEAK_GAIN = 11.22; 
  (* Compressor effect *)
  AL_COMPRESSOR_MIN_ONOFF = 0; 
  AL_COMPRESSOR_MAX_ONOFF = 1; 
  AL_COMPRESSOR_DEFAULT_ONOFF = 1; 
  (* Equalizer effect *)
  AL_EQUALIZER_MIN_LOW_GAIN = 0.126; 
  AL_EQUALIZER_MAX_LOW_GAIN = 7.943; 
  AL_EQUALIZER_DEFAULT_LOW_GAIN = 1.0; 
  AL_EQUALIZER_MIN_LOW_CUTOFF = 50.0; 
  AL_EQUALIZER_MAX_LOW_CUTOFF = 800.0; 
  AL_EQUALIZER_DEFAULT_LOW_CUTOFF = 200.0; 
  AL_EQUALIZER_MIN_MID1_GAIN = 0.126; 
  AL_EQUALIZER_MAX_MID1_GAIN = 7.943; 
  AL_EQUALIZER_DEFAULT_MID1_GAIN = 1.0; 
  AL_EQUALIZER_MIN_MID1_CENTER = 200.0; 
  AL_EQUALIZER_MAX_MID1_CENTER = 3000.0; 
  AL_EQUALIZER_DEFAULT_MID1_CENTER = 500.0; 
  AL_EQUALIZER_MIN_MID1_WIDTH = 0.1; 
  AL_EQUALIZER_MAX_MID1_WIDTH = 1.0; 
  AL_EQUALIZER_DEFAULT_MID1_WIDTH = 1.0; 
  AL_EQUALIZER_MIN_MID2_GAIN = 0.126; 
  AL_EQUALIZER_MAX_MID2_GAIN = 7.943; 
  AL_EQUALIZER_DEFAULT_MID2_GAIN = 1.0; 
  AL_EQUALIZER_MIN_MID2_CENTER = 1000.0; 
  AL_EQUALIZER_MAX_MID2_CENTER = 8000.0; 
  AL_EQUALIZER_DEFAULT_MID2_CENTER = 3000.0; 
  AL_EQUALIZER_MIN_MID2_WIDTH = 0.1; 
  AL_EQUALIZER_MAX_MID2_WIDTH = 1.0; 
  AL_EQUALIZER_DEFAULT_MID2_WIDTH = 1.0; 
  AL_EQUALIZER_MIN_HIGH_GAIN = 0.126; 
  AL_EQUALIZER_MAX_HIGH_GAIN = 7.943; 
  AL_EQUALIZER_DEFAULT_HIGH_GAIN = 1.0; 
  AL_EQUALIZER_MIN_HIGH_CUTOFF = 4000.0; 
  AL_EQUALIZER_MAX_HIGH_CUTOFF = 16000.0; 
  AL_EQUALIZER_DEFAULT_HIGH_CUTOFF = 6000.0; 
  (* Source parameter value ranges and defaults. *)
  AL_MIN_AIR_ABSORPTION_FACTOR = 0.0; 
  AL_MAX_AIR_ABSORPTION_FACTOR = 10.0; 
  AL_DEFAULT_AIR_ABSORPTION_FACTOR = 0.0; 
  AL_MIN_ROOM_ROLLOFF_FACTOR = 0.0; 
  AL_MAX_ROOM_ROLLOFF_FACTOR = 10.0; 
  AL_DEFAULT_ROOM_ROLLOFF_FACTOR = 0.0; 
  AL_MIN_CONE_OUTER_GAINHF = 0.0; 
  AL_MAX_CONE_OUTER_GAINHF = 1.0; 
  AL_DEFAULT_CONE_OUTER_GAINHF = 1.0; 
  AL_MIN_DIRECT_FILTER_GAINHF_AUTO = AL_FALSE; 
  AL_MAX_DIRECT_FILTER_GAINHF_AUTO = AL_TRUE; 
  AL_DEFAULT_DIRECT_FILTER_GAINHF_AUTO = AL_TRUE; 
  AL_MIN_AUXILIARY_SEND_FILTER_GAIN_AUTO = AL_FALSE; 
  AL_MAX_AUXILIARY_SEND_FILTER_GAIN_AUTO = AL_TRUE; 
  AL_DEFAULT_AUXILIARY_SEND_FILTER_GAIN_AUTO = AL_TRUE; 
  AL_MIN_AUXILIARY_SEND_FILTER_GAINHF_AUTO = AL_FALSE; 
  AL_MAX_AUXILIARY_SEND_FILTER_GAINHF_AUTO = AL_TRUE; 
  AL_DEFAULT_AUXILIARY_SEND_FILTER_GAINHF_AUTO = AL_TRUE; 
  (* Listener parameter value ranges and defaults. *)
  AL_MIN_METERS_PER_UNIT = 0.0; // FIXME: was FLT_MIN
  AL_MAX_METERS_PER_UNIT = 1e10; // FIXME: was FLT_MAX
  AL_DEFAULT_METERS_PER_UNIT = 1.0;

procedure alGenEffects(n: ALsizei;  effects: pALuint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alDeleteEffects(n: ALsizei;  effects: pALuint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

function alIsEffect(effect: ALuint): ALboolean; cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alEffecti(effect: ALuint;  param: ALenum;  iValue: ALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alEffectiv(effect: ALuint;  param: ALenum;  piValues: pALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alEffectf(effect: ALuint;  param: ALenum;  flValue: ALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alEffectfv(effect: ALuint;  param: ALenum;  pflValues: pALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetEffecti(effect: ALuint;  param: ALenum;  piValue: pALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetEffectiv(effect: ALuint;  param: ALenum;  piValues: pALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetEffectf(effect: ALuint;  param: ALenum;  pflValue: pALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetEffectfv(effect: ALuint;  param: ALenum;  pflValues: pALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGenFilters(n: ALsizei;  filters: pALuint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alDeleteFilters(n: ALsizei;  filters: pALuint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

function alIsFilter(filter: ALuint): ALboolean; cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alFilteri(filter: ALuint;  param: ALenum;  iValue: ALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alFilteriv(filter: ALuint;  param: ALenum;  piValues: pALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alFilterf(filter: ALuint;  param: ALenum;  flValue: ALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alFilterfv(filter: ALuint;  param: ALenum;  pflValues: pALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetFilteri(filter: ALuint;  param: ALenum;  piValue: pALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetFilteriv(filter: ALuint;  param: ALenum;  piValues: pALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetFilterf(filter: ALuint;  param: ALenum;  pflValue: pALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetFilterfv(filter: ALuint;  param: ALenum;  pflValues: pALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGenAuxiliaryEffectSlots(n: ALsizei;  effectslots: pALuint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alDeleteAuxiliaryEffectSlots(n: ALsizei;  effectslots: pALuint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

function alIsAuxiliaryEffectSlot(effectslot: ALuint): ALboolean; cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alAuxiliaryEffectSloti(effectslot: ALuint;  param: ALenum;  iValue: ALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alAuxiliaryEffectSlotiv(effectslot: ALuint;  param: ALenum;  piValues: pALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alAuxiliaryEffectSlotf(effectslot: ALuint;  param: ALenum;  flValue: ALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alAuxiliaryEffectSlotfv(effectslot: ALuint;  param: ALenum;  pflValues: pALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetAuxiliaryEffectSloti(effectslot: ALuint;  param: ALenum;  piValue: pALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetAuxiliaryEffectSlotiv(effectslot: ALuint;  param: ALenum;  piValues: pALint); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetAuxiliaryEffectSlotf(effectslot: ALuint;  param: ALenum;  pflValue: pALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

procedure alGetAuxiliaryEffectSlotfv(effectslot: ALuint;  param: ALenum;  pflValues: pALfloat); cdecl; external {$IFDEF AL_DYNAMIC}openallib{$ENDIF};

{
type
  /* Effect object function types. */
  typedef void (AL_APIENTRY *LPALGENEFFECTS)(ALsizei, ALuint*);
  typedef void (AL_APIENTRY *LPALDELETEEFFECTS)(ALsizei, const ALuint*);
  typedef ALboolean (AL_APIENTRY *LPALISEFFECT)(ALuint);
  typedef void (AL_APIENTRY *LPALEFFECTI)(ALuint, ALenum, ALint);
  typedef void (AL_APIENTRY *LPALEFFECTIV)(ALuint, ALenum, const ALint*);
  typedef void (AL_APIENTRY *LPALEFFECTF)(ALuint, ALenum, ALfloat);
  typedef void (AL_APIENTRY *LPALEFFECTFV)(ALuint, ALenum, const ALfloat*);
  typedef void (AL_APIENTRY *LPALGETEFFECTI)(ALuint, ALenum, ALint*);
  typedef void (AL_APIENTRY *LPALGETEFFECTIV)(ALuint, ALenum, ALint*);
  typedef void (AL_APIENTRY *LPALGETEFFECTF)(ALuint, ALenum, ALfloat*);
  typedef void (AL_APIENTRY *LPALGETEFFECTFV)(ALuint, ALenum, ALfloat*);

  /* Filter object function types. */
  typedef void (AL_APIENTRY *LPALGENFILTERS)(ALsizei, ALuint*);
  typedef void (AL_APIENTRY *LPALDELETEFILTERS)(ALsizei, const ALuint*);
  typedef ALboolean (AL_APIENTRY *LPALISFILTER)(ALuint);
  typedef void (AL_APIENTRY *LPALFILTERI)(ALuint, ALenum, ALint);
  typedef void (AL_APIENTRY *LPALFILTERIV)(ALuint, ALenum, const ALint*);
  typedef void (AL_APIENTRY *LPALFILTERF)(ALuint, ALenum, ALfloat);
  typedef void (AL_APIENTRY *LPALFILTERFV)(ALuint, ALenum, const ALfloat*);
  typedef void (AL_APIENTRY *LPALGETFILTERI)(ALuint, ALenum, ALint*);
  typedef void (AL_APIENTRY *LPALGETFILTERIV)(ALuint, ALenum, ALint*);
  typedef void (AL_APIENTRY *LPALGETFILTERF)(ALuint, ALenum, ALfloat*);
  typedef void (AL_APIENTRY *LPALGETFILTERFV)(ALuint, ALenum, ALfloat*);

  /* Auxiliary Effect Slot object function types. */
  typedef void (AL_APIENTRY *LPALGENAUXILIARYEFFECTSLOTS)(ALsizei, ALuint*);
  typedef void (AL_APIENTRY *LPALDELETEAUXILIARYEFFECTSLOTS)(ALsizei, const ALuint*);
  typedef ALboolean (AL_APIENTRY *LPALISAUXILIARYEFFECTSLOT)(ALuint);
  typedef void (AL_APIENTRY *LPALAUXILIARYEFFECTSLOTI)(ALuint, ALenum, ALint);
  typedef void (AL_APIENTRY *LPALAUXILIARYEFFECTSLOTIV)(ALuint, ALenum, const ALint*);
  typedef void (AL_APIENTRY *LPALAUXILIARYEFFECTSLOTF)(ALuint, ALenum, ALfloat);
  typedef void (AL_APIENTRY *LPALAUXILIARYEFFECTSLOTFV)(ALuint, ALenum, const ALfloat*);
  typedef void (AL_APIENTRY *LPALGETAUXILIARYEFFECTSLOTI)(ALuint, ALenum, ALint*);
  typedef void (AL_APIENTRY *LPALGETAUXILIARYEFFECTSLOTIV)(ALuint, ALenum, ALint*);
  typedef void (AL_APIENTRY *LPALGETAUXILIARYEFFECTSLOTF)(ALuint, ALenum, ALfloat*);
  typedef void (AL_APIENTRY *LPALGETAUXILIARYEFFECTSLOTFV)(ALuint, ALenum, ALfloat*);
}