COM Objects > Effects object > Methods > Effects.VolumeSlidingLevelApply method

Remarks

Applies a linear sliding volume to the given song's range.

A successful call to this method will fire the SoundEditStarted event followed by a number of SoundEditPerc events and finally by the SoundEditDone event.

For further details about methods related to the use of special effects refer to the Effects COM object.

Syntax

[Visual Basic]

control.Effects.VolumeSlidingLevelApply (

nStartPosition as Long,

nEndPosition as Long,

nAffectedChannel as enumChannelsMask,

fInitialVolume as Single,

fFinalVolume as Single,

nScaleType as enumVolumeScales

) as enumErrorCodes

[C++]

short control.Effects.VolumeSlidingLevelApply (

long nStartPosition,

long nEndPosition,

short nAffectedChannel,

float fInitialVolume,

float fFinalVolume,

short nScaleType

);

Parameter

Description

nStartPosition

Start position, expressed in milliseconds, of the affected sound range.

nEndPosition

End position, expressed in milliseconds, of the affected sound range.. If set to -1 the end position will be set to the end of the sound.

nAffectedChannel

Numeric value that determines the combination of affected channels.

Supported values are the following:

Mnemonic constant	Value	Meaning
CHANNEL_MASK_0	1 (0x01)	Channel 0 or left channel
CHANNEL_MASK_1	2 (0x02)	Channel 1 or right channel
CHANNEL_MASK_2	4 (0x04)	Channel 2
CHANNEL_MASK_3	8 (0x08)	Channel 3
CHANNEL_MASK_4	16 (0x10)	Channel 4
CHANNEL_MASK_5	32 (0x20)	Channel 5
CHANNEL_MASK_6	64 (0x40)	Channel 6
CHANNEL_MASK_7	128 (0x80)	Channel 7
CHANNEL_MASK_LEFTS	85 (0x55)	All left channels
CHANNEL_MASK_RIGHTS	170 (0xAA)	All right channels
CHANNEL_MASK_ALL	255 (0xFF)	All available channels

fInitialVolume

Floating point value representing the sliding initial volume

fFinalVolume

Floating point value representing the sliding final volume

nScaleType

The volume scaling type.

Supported values are the following:

Mnemonic constant

Value

Meaning

SCALE_LINEAR

The passed volume is based upon a linear scale:

- value 0.0 mutes the sound

- values higher than 0.0 and lower than 100.0 attenuate the sound

- value 100.0 keeps sound level unchanged

- values higher than 100.0 amplify the sound

SCALE_LOG

The passed volume, expressed in dB, is based upon a logarithmic scale:

- value -100.0 mutes the sound

- values higher than -100.0 and lower than 0.0 attenuate the sound

- value 0.0 keeps sound level unchanged

- values higher than 0.0 amplify the sound

The actual applied formula for converting a linear volume into a logarithmic volume is the following:

VolumeInDB = 20 * log10 (VolumeLinear/100)

The C syntax for converting a logarithmic volume into a linear volume is the following:

VolumeLinear = 100 * pow (10, VolumeInDB/20);

Return value

Value	Meaning

Negative value	An error occurred (see the LastError property for further error details)
enumErrorCodes.ERR_NOERROR (0)	The method call was successful.